Finding the Fourth Proportional to 9,057.59, 12,499.20 and 5,078.87

Step by Step Solution

1. Step 1: Write the proportion equation
   9,057.59 : 12,499.20 = 5,078.87 : x
2. Step 2: Convert to fraction form
   9,057.59/12,499.20 = 5,078.87/x
3. Step 3: Cross multiply
   9,057.59x = 12,499.20 × 5,078.87
4. Step 4: Simplify right side
   9,057.59x = 63,481,749.41
5. Step 5: Solve for x
   x = 63,481,749.41/9,057.59
6. Step 6: Final answer
   x = 7,008.68