Finding the Fourth Proportional to 12,680.76, 17,499.56 and 7,645.24

Step by Step Solution

1. Step 1: Write the proportion equation
   12,680.76 : 17,499.56 = 7,645.24 : x
2. Step 2: Convert to fraction form
   12,680.76/17,499.56 = 7,645.24/x
3. Step 3: Cross multiply
   12,680.76x = 17,499.56 × 7,645.24
4. Step 4: Simplify right side
   12,680.76x = 133,788,336.09
5. Step 5: Solve for x
   x = 133,788,336.09/12,680.76
6. Step 6: Final answer
   x = 10,550.50