Finding the Fourth Proportional to 142,086.65, 196,079.20 and 78,424.01

Step by Step Solution

1. Step 1: Write the proportion equation
   142,086.65 : 196,079.20 = 78,424.01 : x
2. Step 2: Convert to fraction form
   142,086.65/196,079.20 = 78,424.01/x
3. Step 3: Cross multiply
   142,086.65x = 196,079.20 × 78,424.01
4. Step 4: Simplify right side
   142,086.65x = 15,377,317,141.59
5. Step 5: Solve for x
   x = 15,377,317,141.59/142,086.65
6. Step 6: Final answer
   x = 108,224.93