Finding the Fourth Proportional to 78,686.56, 108,586.05 and 42,876.85

Step by Step Solution

1. Step 1: Write the proportion equation
   78,686.56 : 108,586.05 = 42,876.85 : x
2. Step 2: Convert to fraction form
   78,686.56/108,586.05 = 42,876.85/x
3. Step 3: Cross multiply
   78,686.56x = 108,586.05 × 42,876.85
4. Step 4: Simplify right side
   78,686.56x = 4,655,827,777.94
5. Step 5: Solve for x
   x = 4,655,827,777.94/78,686.56
6. Step 6: Final answer
   x = 59,169.29