Finding the Fourth Proportional to 12,689.96, 17,512.20 and 7,653.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,689.96 : 17,512.20 = 7,653.15 : x
2. Step 2: Convert to fraction form
   12,689.96/17,512.20 = 7,653.15/x
3. Step 3: Cross multiply
   12,689.96x = 17,512.20 × 7,653.15
4. Step 4: Simplify right side
   12,689.96x = 134,023,493.43
5. Step 5: Solve for x
   x = 134,023,493.43/12,689.96
6. Step 6: Final answer
   x = 10,561.38