Finding the Fourth Proportional to 123,324.89, 170,134.07 and 72,311.72

Step by Step Solution

1. Step 1: Write the proportion equation
   123,324.89 : 170,134.07 = 72,311.72 : x
2. Step 2: Convert to fraction form
   123,324.89/170,134.07 = 72,311.72/x
3. Step 3: Cross multiply
   123,324.89x = 170,134.07 × 72,311.72
4. Step 4: Simplify right side
   123,324.89x = 12,302,686,020.07
5. Step 5: Solve for x
   x = 12,302,686,020.07/123,324.89
6. Step 6: Final answer
   x = 99,758.34