Finding the Fourth Proportional to 12,688.29, 17,516.88 and 7,653.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,688.29 : 17,516.88 = 7,653.78 : x
2. Step 2: Convert to fraction form
   12,688.29/17,516.88 = 7,653.78/x
3. Step 3: Cross multiply
   12,688.29x = 17,516.88 × 7,653.78
4. Step 4: Simplify right side
   12,688.29x = 134,070,345.81
5. Step 5: Solve for x
   x = 134,070,345.81/12,688.29
6. Step 6: Final answer
   x = 10,566.46