Finding the Fourth Proportional to 9,057.43, 12,499.09 and 5,078.53

Step by Step Solution

1. Step 1: Write the proportion equation
   9,057.43 : 12,499.09 = 5,078.53 : x
2. Step 2: Convert to fraction form
   9,057.43/12,499.09 = 5,078.53/x
3. Step 3: Cross multiply
   9,057.43x = 12,499.09 × 5,078.53
4. Step 4: Simplify right side
   9,057.43x = 63,477,003.54
5. Step 5: Solve for x
   x = 63,477,003.54/9,057.43
6. Step 6: Final answer
   x = 7,008.28