Finding the Fourth Proportional to 15,870,139.25, 21,891,490.52 and 9,980,431.61

Step by Step Solution

1. Step 1: Write the proportion equation
   15,870,139.25 : 21,891,490.52 = 9,980,431.61 : x
2. Step 2: Convert to fraction form
   15,870,139.25/21,891,490.52 = 9,980,431.61/x
3. Step 3: Cross multiply
   15,870,139.25x = 21,891,490.52 × 9,980,431.61
4. Step 4: Simplify right side
   15,870,139.25x = 218,486,523,816,463.75
5. Step 5: Solve for x
   x = 218,486,523,816,463.75/15,870,139.25
6. Step 6: Final answer
   x = 13,767,145.99