Finding the Fourth Proportional to 78,711.28, 108,623.94 and 42,903.61

Step by Step Solution

1. Step 1: Write the proportion equation
   78,711.28 : 108,623.94 = 42,903.61 : x
2. Step 2: Convert to fraction form
   78,711.28/108,623.94 = 42,903.61/x
3. Step 3: Cross multiply
   78,711.28x = 108,623.94 × 42,903.61
4. Step 4: Simplify right side
   78,711.28x = 4,660,359,158.42
5. Step 5: Solve for x
   x = 4,660,359,158.42/78,711.28
6. Step 6: Final answer
   x = 59,208.28