Finding the Fourth Proportional to 78,411.74, 108,206.87 and 42,602.31

Step by Step Solution

1. Step 1: Write the proportion equation
   78,411.74 : 108,206.87 = 42,602.31 : x
2. Step 2: Convert to fraction form
   78,411.74/108,206.87 = 42,602.31/x
3. Step 3: Cross multiply
   78,411.74x = 108,206.87 × 42,602.31
4. Step 4: Simplify right side
   78,411.74x = 4,609,862,406.86
5. Step 5: Solve for x
   x = 4,609,862,406.86/78,411.74
6. Step 6: Final answer
   x = 58,790.47