Finding the Fourth Proportional to 9,057.68, 12,499.44 and 5,078.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,057.68 : 12,499.44 = 5,078.78 : x
2. Step 2: Convert to fraction form
   9,057.68/12,499.44 = 5,078.78/x
3. Step 3: Cross multiply
   9,057.68x = 12,499.44 × 5,078.78
4. Step 4: Simplify right side
   9,057.68x = 63,481,905.88
5. Step 5: Solve for x
   x = 63,481,905.88/9,057.68
6. Step 6: Final answer
   x = 7,008.63