Finding the Fourth Proportional to 21,287,476.31, 31,951,401.92 and 13,175,915.18

Step by Step Solution

1. Step 1: Write the proportion equation
   21,287,476.31 : 31,951,401.92 = 13,175,915.18 : x
2. Step 2: Convert to fraction form
   21,287,476.31/31,951,401.92 = 13,175,915.18/x
3. Step 3: Cross multiply
   21,287,476.31x = 31,951,401.92 × 13,175,915.18
4. Step 4: Simplify right side
   21,287,476.31x = 420,988,961,354,372.56
5. Step 5: Solve for x
   x = 420,988,961,354,372.56/21,287,476.31
6. Step 6: Final answer
   x = 19,776,367.82