Finding the Fourth Proportional to 78,711.30, 108,621.18 and 42,901.20

Step by Step Solution

1. Step 1: Write the proportion equation
   78,711.30 : 108,621.18 = 42,901.20 : x
2. Step 2: Convert to fraction form
   78,711.30/108,621.18 = 42,901.20/x
3. Step 3: Cross multiply
   78,711.30x = 108,621.18 × 42,901.20
4. Step 4: Simplify right side
   78,711.30x = 4,659,978,967.42
5. Step 5: Solve for x
   x = 4,659,978,967.42/78,711.30
6. Step 6: Final answer
   x = 59,203.43