Finding the Fourth Proportional to 78,418.15, 108,216.86 and 42,608.30

Step by Step Solution

1. Step 1: Write the proportion equation
   78,418.15 : 108,216.86 = 42,608.30 : x
2. Step 2: Convert to fraction form
   78,418.15/108,216.86 = 42,608.30/x
3. Step 3: Cross multiply
   78,418.15x = 108,216.86 × 42,608.30
4. Step 4: Simplify right side
   78,418.15x = 4,610,936,435.94
5. Step 5: Solve for x
   x = 4,610,936,435.94/78,418.15
6. Step 6: Final answer
   x = 58,799.36