Finding the Fourth Proportional to 142,085.50, 196,077 and 78,423.28

Step by Step Solution

1. Step 1: Write the proportion equation
   142,085.50 : 196,077 = 78,423.28 : x
2. Step 2: Convert to fraction form
   142,085.50/196,077 = 78,423.28/x
3. Step 3: Cross multiply
   142,085.50x = 196,077 × 78,423.28
4. Step 4: Simplify right side
   142,085.50x = 15,377,001,472.56
5. Step 5: Solve for x
   x = 15,377,001,472.56/142,085.50
6. Step 6: Final answer
   x = 108,223.58