Finding the Fourth Proportional to 12,680.96, 17,498.40 and 7,645.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,680.96 : 17,498.40 = 7,645.28 : x
2. Step 2: Convert to fraction form
   12,680.96/17,498.40 = 7,645.28/x
3. Step 3: Cross multiply
   12,680.96x = 17,498.40 × 7,645.28
4. Step 4: Simplify right side
   12,680.96x = 133,780,167.55
5. Step 5: Solve for x
   x = 133,780,167.55/12,680.96
6. Step 6: Final answer
   x = 10,549.69