Finding the Fourth Proportional to 146,046.20, 201,543.78 and 78,978.20

Step by Step Solution

1. Step 1: Write the proportion equation
   146,046.20 : 201,543.78 = 78,978.20 : x
2. Step 2: Convert to fraction form
   146,046.20/201,543.78 = 78,978.20/x
3. Step 3: Cross multiply
   146,046.20x = 201,543.78 × 78,978.20
4. Step 4: Simplify right side
   146,046.20x = 15,917,563,957.88
5. Step 5: Solve for x
   x = 15,917,563,957.88/146,046.20
6. Step 6: Final answer
   x = 108,989.93