Finding the Fourth Proportional to 123,218.57, 170,077.98 and 72,242.37

Step by Step Solution

1. Step 1: Write the proportion equation
   123,218.57 : 170,077.98 = 72,242.37 : x
2. Step 2: Convert to fraction form
   123,218.57/170,077.98 = 72,242.37/x
3. Step 3: Cross multiply
   123,218.57x = 170,077.98 × 72,242.37
4. Step 4: Simplify right side
   123,218.57x = 12,286,836,360.01
5. Step 5: Solve for x
   x = 12,286,836,360.01/123,218.57
6. Step 6: Final answer
   x = 99,715.78