Finding the Fourth Proportional to 142,510.20, 213,758.76 and 79,728.72

Step by Step Solution

1. Step 1: Write the proportion equation
   142,510.20 : 213,758.76 = 79,728.72 : x
2. Step 2: Convert to fraction form
   142,510.20/213,758.76 = 79,728.72/x
3. Step 3: Cross multiply
   142,510.20x = 213,758.76 × 79,728.72
4. Step 4: Simplify right side
   142,510.20x = 17,042,712,323.59
5. Step 5: Solve for x
   x = 17,042,712,323.59/142,510.20
6. Step 6: Final answer
   x = 119,589.42