Finding the Fourth Proportional to 78,787.26, 108,727.86 and 42,978.54

Step by Step Solution

1. Step 1: Write the proportion equation
   78,787.26 : 108,727.86 = 42,978.54 : x
2. Step 2: Convert to fraction form
   78,787.26/108,727.86 = 42,978.54/x
3. Step 3: Cross multiply
   78,787.26x = 108,727.86 × 42,978.54
4. Step 4: Simplify right side
   78,787.26x = 4,672,964,680.12
5. Step 5: Solve for x
   x = 4,672,964,680.12/78,787.26
6. Step 6: Final answer
   x = 59,311.17