Finding the Fourth Proportional to 78,521.92, 108,357.12 and 42,711.96

Step by Step Solution

1. Step 1: Write the proportion equation
   78,521.92 : 108,357.12 = 42,711.96 : x
2. Step 2: Convert to fraction form
   78,521.92/108,357.12 = 42,711.96/x
3. Step 3: Cross multiply
   78,521.92x = 108,357.12 × 42,711.96
4. Step 4: Simplify right side
   78,521.92x = 4,628,144,975.16
5. Step 5: Solve for x
   x = 4,628,144,975.16/78,521.92
6. Step 6: Final answer
   x = 58,940.80