Finding the Fourth Proportional to 78,786.88, 108,727.36 and 42,978.18

Step by Step Solution

1. Step 1: Write the proportion equation
   78,786.88 : 108,727.36 = 42,978.18 : x
2. Step 2: Convert to fraction form
   78,786.88/108,727.36 = 42,978.18/x
3. Step 3: Cross multiply
   78,786.88x = 108,727.36 × 42,978.18
4. Step 4: Simplify right side
   78,786.88x = 4,672,904,049.00
5. Step 5: Solve for x
   x = 4,672,904,049.00/78,786.88
6. Step 6: Final answer
   x = 59,310.69