Finding the Fourth Proportional to 142,357.25, 196,435.98 and 78,686.39

Step by Step Solution

1. Step 1: Write the proportion equation
   142,357.25 : 196,435.98 = 78,686.39 : x
2. Step 2: Convert to fraction form
   142,357.25/196,435.98 = 78,686.39/x
3. Step 3: Cross multiply
   142,357.25x = 196,435.98 × 78,686.39
4. Step 4: Simplify right side
   142,357.25x = 15,456,838,132.31
5. Step 5: Solve for x
   x = 15,456,838,132.31/142,357.25
6. Step 6: Final answer
   x = 108,577.81