Finding the Fourth Proportional to 78,711.12, 108,618.17 and 42,900.36

Step by Step Solution

1. Step 1: Write the proportion equation
   78,711.12 : 108,618.17 = 42,900.36 : x
2. Step 2: Convert to fraction form
   78,711.12/108,618.17 = 42,900.36/x
3. Step 3: Cross multiply
   78,711.12x = 108,618.17 × 42,900.36
4. Step 4: Simplify right side
   78,711.12x = 4,659,758,381.04
5. Step 5: Solve for x
   x = 4,659,758,381.04/78,711.12
6. Step 6: Final answer
   x = 59,200.76