Finding the Fourth Proportional to 78,686.28, 108,585.72 and 42,876.60

Step by Step Solution

1. Step 1: Write the proportion equation
   78,686.28 : 108,585.72 = 42,876.60 : x
2. Step 2: Convert to fraction form
   78,686.28/108,585.72 = 42,876.60/x
3. Step 3: Cross multiply
   78,686.28x = 108,585.72 × 42,876.60
4. Step 4: Simplify right side
   78,686.28x = 4,655,786,482.15
5. Step 5: Solve for x
   x = 4,655,786,482.15/78,686.28
6. Step 6: Final answer
   x = 59,168.97