Finding the Fourth Proportional to 142,118.64, 196,123.76 and 78,456.48

Step by Step Solution

1. Step 1: Write the proportion equation
   142,118.64 : 196,123.76 = 78,456.48 : x
2. Step 2: Convert to fraction form
   142,118.64/196,123.76 = 78,456.48/x
3. Step 3: Cross multiply
   142,118.64x = 196,123.76 × 78,456.48
4. Step 4: Simplify right side
   142,118.64x = 15,387,179,853.96
5. Step 5: Solve for x
   x = 15,387,179,853.96/142,118.64
6. Step 6: Final answer
   x = 108,269.96