Finding the Fourth Proportional to 142,502.72, 213,713.92 and 42,639.04

Step by Step Solution

1. Step 1: Write the proportion equation
   142,502.72 : 213,713.92 = 42,639.04 : x
2. Step 2: Convert to fraction form
   142,502.72/213,713.92 = 42,639.04/x
3. Step 3: Cross multiply
   142,502.72x = 213,713.92 × 42,639.04
4. Step 4: Simplify right side
   142,502.72x = 9,112,556,383.44
5. Step 5: Solve for x
   x = 9,112,556,383.44/142,502.72
6. Step 6: Final answer
   x = 63,946.54