Finding the Fourth Proportional to 142,128.72, 196,138.24 and 78,467.04

Step by Step Solution

1. Step 1: Write the proportion equation
   142,128.72 : 196,138.24 = 78,467.04 : x
2. Step 2: Convert to fraction form
   142,128.72/196,138.24 = 78,467.04/x
3. Step 3: Cross multiply
   142,128.72x = 196,138.24 × 78,467.04
4. Step 4: Simplify right side
   142,128.72x = 15,390,387,123.61
5. Step 5: Solve for x
   x = 15,390,387,123.61/142,128.72
6. Step 6: Final answer
   x = 108,284.85