Finding the Fourth Proportional to 64,565.50, 89,105.25 and 39,419.86

Step by Step Solution

1. Step 1: Write the proportion equation
   64,565.50 : 89,105.25 = 39,419.86 : x
2. Step 2: Convert to fraction form
   64,565.50/89,105.25 = 39,419.86/x
3. Step 3: Cross multiply
   64,565.50x = 89,105.25 × 39,419.86
4. Step 4: Simplify right side
   64,565.50x = 3,512,516,480.27
5. Step 5: Solve for x
   x = 3,512,516,480.27/64,565.50
6. Step 6: Final answer
   x = 54,402.37