Finding the Fourth Proportional to 78,786.86, 108,727.38 and 42,978.17

Step by Step Solution

1. Step 1: Write the proportion equation
   78,786.86 : 108,727.38 = 42,978.17 : x
2. Step 2: Convert to fraction form
   78,786.86/108,727.38 = 42,978.17/x
3. Step 3: Cross multiply
   78,786.86x = 108,727.38 × 42,978.17
4. Step 4: Simplify right side
   78,786.86x = 4,672,904,093.11
5. Step 5: Solve for x
   x = 4,672,904,093.11/78,786.86
6. Step 6: Final answer
   x = 59,310.71