Finding the Fourth Proportional to 78,691.68, 108,591.76 and 42,880.98

Step by Step Solution

1. Step 1: Write the proportion equation
   78,691.68 : 108,591.76 = 42,880.98 : x
2. Step 2: Convert to fraction form
   78,691.68/108,591.76 = 42,880.98/x
3. Step 3: Cross multiply
   78,691.68x = 108,591.76 × 42,880.98
4. Step 4: Simplify right side
   78,691.68x = 4,656,521,088.72
5. Step 5: Solve for x
   x = 4,656,521,088.72/78,691.68
6. Step 6: Final answer
   x = 59,174.25