Finding the Fourth Proportional to 78,671.86, 108,567.18 and 42,861.87

Step by Step Solution

1. Step 1: Write the proportion equation
   78,671.86 : 108,567.18 = 42,861.87 : x
2. Step 2: Convert to fraction form
   78,671.86/108,567.18 = 42,861.87/x
3. Step 3: Cross multiply
   78,671.86x = 108,567.18 × 42,861.87
4. Step 4: Simplify right side
   78,671.86x = 4,653,392,113.34
5. Step 5: Solve for x
   x = 4,653,392,113.34/78,671.86
6. Step 6: Final answer
   x = 59,149.39