Finding the Fourth Proportional to 28,685,872.72, 39,586,503.72 and 15,808,816.72

Step by Step Solution

1. Step 1: Write the proportion equation
   28,685,872.72 : 39,586,503.72 = 15,808,816.72 : x
2. Step 2: Convert to fraction form
   28,685,872.72/39,586,503.72 = 15,808,816.72/x
3. Step 3: Cross multiply
   28,685,872.72x = 39,586,503.72 × 15,808,816.72
4. Step 4: Simplify right side
   28,685,872.72x = 625,815,781,895,078.25
5. Step 5: Solve for x
   x = 625,815,781,895,078.25/28,685,872.72
6. Step 6: Final answer
   x = 21,816,166.72