Finding the Fourth Proportional to 12,706.76, 17,535.84 and 7,400.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,706.76 : 17,535.84 = 7,400.72 : x
2. Step 2: Convert to fraction form
   12,706.76/17,535.84 = 7,400.72/x
3. Step 3: Cross multiply
   12,706.76x = 17,535.84 × 7,400.72
4. Step 4: Simplify right side
   12,706.76x = 129,777,841.80
5. Step 5: Solve for x
   x = 129,777,841.80/12,706.76
6. Step 6: Final answer
   x = 10,213.29