Finding the Fourth Proportional to 57,499.21, 79,385.37 and 39,380.32

Step by Step Solution

1. Step 1: Write the proportion equation
   57,499.21 : 79,385.37 = 39,380.32 : x
2. Step 2: Convert to fraction form
   57,499.21/79,385.37 = 39,380.32/x
3. Step 3: Cross multiply
   57,499.21x = 79,385.37 × 39,380.32
4. Step 4: Simplify right side
   57,499.21x = 3,126,221,273.92
5. Step 5: Solve for x
   x = 3,126,221,273.92/57,499.21
6. Step 6: Final answer
   x = 54,369.81