Finding the Fourth Proportional to 142,647.42, 196,854.39 and 78,989.34

Step by Step Solution

1. Step 1: Write the proportion equation
   142,647.42 : 196,854.39 = 78,989.34 : x
2. Step 2: Convert to fraction form
   142,647.42/196,854.39 = 78,989.34/x
3. Step 3: Cross multiply
   142,647.42x = 196,854.39 × 78,989.34
4. Step 4: Simplify right side
   142,647.42x = 15,549,398,342.20
5. Step 5: Solve for x
   x = 15,549,398,342.20/142,647.42
6. Step 6: Final answer
   x = 109,005.82