Finding the Fourth Proportional to 12,878.80, 17,772.72 and 7,502.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,878.80 : 17,772.72 = 7,502.56 : x
2. Step 2: Convert to fraction form
   12,878.80/17,772.72 = 7,502.56/x
3. Step 3: Cross multiply
   12,878.80x = 17,772.72 × 7,502.56
4. Step 4: Simplify right side
   12,878.80x = 133,340,898.16
5. Step 5: Solve for x
   x = 133,340,898.16/12,878.80
6. Step 6: Final answer
   x = 10,353.52