Finding the Fourth Proportional to 78,685.98, 108,586.65 and 42,876

Step by Step Solution

1. Step 1: Write the proportion equation
   78,685.98 : 108,586.65 = 42,876 : x
2. Step 2: Convert to fraction form
   78,685.98/108,586.65 = 42,876/x
3. Step 3: Cross multiply
   78,685.98x = 108,586.65 × 42,876
4. Step 4: Simplify right side
   78,685.98x = 4,655,761,205.40
5. Step 5: Solve for x
   x = 4,655,761,205.40/78,685.98
6. Step 6: Final answer
   x = 59,168.88