Finding the Fourth Proportional to 78,687.49, 108,587.31 and 42,877.75

Step by Step Solution

1. Step 1: Write the proportion equation
   78,687.49 : 108,587.31 = 42,877.75 : x
2. Step 2: Convert to fraction form
   78,687.49/108,587.31 = 42,877.75/x
3. Step 3: Cross multiply
   78,687.49x = 108,587.31 × 42,877.75
4. Step 4: Simplify right side
   78,687.49x = 4,655,979,531.35
5. Step 5: Solve for x
   x = 4,655,979,531.35/78,687.49
6. Step 6: Final answer
   x = 59,170.52