Finding the Fourth Proportional to 78,425.96, 108,224.85 and 42,615.20

Step by Step Solution

1. Step 1: Write the proportion equation
   78,425.96 : 108,224.85 = 42,615.20 : x
2. Step 2: Convert to fraction form
   78,425.96/108,224.85 = 42,615.20/x
3. Step 3: Cross multiply
   78,425.96x = 108,224.85 × 42,615.20
4. Step 4: Simplify right side
   78,425.96x = 4,612,023,086.60
5. Step 5: Solve for x
   x = 4,612,023,086.60/78,425.96
6. Step 6: Final answer
   x = 58,807.36