Finding the Fourth Proportional to 142,339.40, 196,436.04 and 78,683.12

Step by Step Solution

1. Step 1: Write the proportion equation
   142,339.40 : 196,436.04 = 78,683.12 : x
2. Step 2: Convert to fraction form
   142,339.40/196,436.04 = 78,683.12/x
3. Step 3: Cross multiply
   142,339.40x = 196,436.04 × 78,683.12
4. Step 4: Simplify right side
   142,339.40x = 15,456,200,507.64
5. Step 5: Solve for x
   x = 15,456,200,507.64/142,339.40
6. Step 6: Final answer
   x = 108,586.94