Finding the Fourth Proportional to 142,665.60, 213,793.60 and 104,931.20

Step by Step Solution

1. Step 1: Write the proportion equation
   142,665.60 : 213,793.60 = 104,931.20 : x
2. Step 2: Convert to fraction form
   142,665.60/213,793.60 = 104,931.20/x
3. Step 3: Cross multiply
   142,665.60x = 213,793.60 × 104,931.20
4. Step 4: Simplify right side
   142,665.60x = 22,433,619,000.32
5. Step 5: Solve for x
   x = 22,433,619,000.32/142,665.60
6. Step 6: Final answer
   x = 157,246.17