Finding the Fourth Proportional to 12,688.50, 17,499.39 and 7,651.62

Step by Step Solution

1. Step 1: Write the proportion equation
   12,688.50 : 17,499.39 = 7,651.62 : x
2. Step 2: Convert to fraction form
   12,688.50/17,499.39 = 7,651.62/x
3. Step 3: Cross multiply
   12,688.50x = 17,499.39 × 7,651.62
4. Step 4: Simplify right side
   12,688.50x = 133,898,682.51
5. Step 5: Solve for x
   x = 133,898,682.51/12,688.50
6. Step 6: Final answer
   x = 10,552.76