Finding the Fourth Proportional to 142,091.72, 196,086.59 and 78,429.53

Step by Step Solution

1. Step 1: Write the proportion equation
   142,091.72 : 196,086.59 = 78,429.53 : x
2. Step 2: Convert to fraction form
   142,091.72/196,086.59 = 78,429.53/x
3. Step 3: Cross multiply
   142,091.72x = 196,086.59 × 78,429.53
4. Step 4: Simplify right side
   142,091.72x = 15,378,979,485.18
5. Step 5: Solve for x
   x = 15,378,979,485.18/142,091.72
6. Step 6: Final answer
   x = 108,232.76