Finding the Fourth Proportional to 142,356.75, 196,435.29 and 78,685.89

Step by Step Solution

1. Step 1: Write the proportion equation
   142,356.75 : 196,435.29 = 78,685.89 : x
2. Step 2: Convert to fraction form
   142,356.75/196,435.29 = 78,685.89/x
3. Step 3: Cross multiply
   142,356.75x = 196,435.29 × 78,685.89
4. Step 4: Simplify right side
   142,356.75x = 15,456,685,621.06
5. Step 5: Solve for x
   x = 15,456,685,621.06/142,356.75
6. Step 6: Final answer
   x = 108,577.12