Finding the Fourth Proportional to 10,210.15, 15,328.18 and 8,680.87

Step by Step Solution

1. Step 1: Write the proportion equation
   10,210.15 : 15,328.18 = 8,680.87 : x
2. Step 2: Convert to fraction form
   10,210.15/15,328.18 = 8,680.87/x
3. Step 3: Cross multiply
   10,210.15x = 15,328.18 × 8,680.87
4. Step 4: Simplify right side
   10,210.15x = 133,061,861.28
5. Step 5: Solve for x
   x = 133,061,861.28/10,210.15
6. Step 6: Final answer
   x = 13,032.32