The spelling of the word "rianto" can be explained using IPA phonetic transcription. The word is pronounced as /riːˈæntəʊ/. The first syllable "ri" is pronounced as "ree" with a long "i" sound. The second syllable "an" is pronounced as "æn" with a short "a" sound. The ending syllable "to" is pronounced as "tow" with a long "o" sound. Therefore, the spelling of "rianto" is phonetically accurate and represents the pronunciation of the word.