Finding the Fourth Proportional to 78,686.31, 108,585.71 and 42,876.63

Step by Step Solution

1. Step 1: Write the proportion equation
   78,686.31 : 108,585.71 = 42,876.63 : x
2. Step 2: Convert to fraction form
   78,686.31/108,585.71 = 42,876.63/x
3. Step 3: Cross multiply
   78,686.31x = 108,585.71 × 42,876.63
4. Step 4: Simplify right side
   78,686.31x = 4,655,789,096.57
5. Step 5: Solve for x
   x = 4,655,789,096.57/78,686.31
6. Step 6: Final answer
   x = 59,168.99