Finding the Fourth Proportional to 9,887.57, 14,812.71 and 7,685.60

Step by Step Solution

1. Step 1: Write the proportion equation
   9,887.57 : 14,812.71 = 7,685.60 : x
2. Step 2: Convert to fraction form
   9,887.57/14,812.71 = 7,685.60/x
3. Step 3: Cross multiply
   9,887.57x = 14,812.71 × 7,685.60
4. Step 4: Simplify right side
   9,887.57x = 113,844,563.98
5. Step 5: Solve for x
   x = 113,844,563.98/9,887.57
6. Step 6: Final answer
   x = 11,513.91