Finding the Fourth Proportional to 142,155.07, 196,171.42 and 78,491.50

Step by Step Solution

1. Step 1: Write the proportion equation
   142,155.07 : 196,171.42 = 78,491.50 : x
2. Step 2: Convert to fraction form
   142,155.07/196,171.42 = 78,491.50/x
3. Step 3: Cross multiply
   142,155.07x = 196,171.42 × 78,491.50
4. Step 4: Simplify right side
   142,155.07x = 15,397,789,012.93
5. Step 5: Solve for x
   x = 15,397,789,012.93/142,155.07
6. Step 6: Final answer
   x = 108,316.85