Finding the Fourth Proportional to 21,287,482.57, 31,951,411.31 and 13,175,921.41

Step by Step Solution

1. Step 1: Write the proportion equation
   21,287,482.57 : 31,951,411.31 = 13,175,921.41 : x
2. Step 2: Convert to fraction form
   21,287,482.57/31,951,411.31 = 13,175,921.41/x
3. Step 3: Cross multiply
   21,287,482.57x = 31,951,411.31 × 13,175,921.41
4. Step 4: Simplify right side
   21,287,482.57x = 420,989,284,359,145.12
5. Step 5: Solve for x
   x = 420,989,284,359,145.12/21,287,482.57
6. Step 6: Final answer
   x = 19,776,377.17