Finding the Fourth Proportional to 123,375.68, 170,259.61 and 72,389.28

Step by Step Solution

1. Step 1: Write the proportion equation
   123,375.68 : 170,259.61 = 72,389.28 : x
2. Step 2: Convert to fraction form
   123,375.68/170,259.61 = 72,389.28/x
3. Step 3: Cross multiply
   123,375.68x = 170,259.61 × 72,389.28
4. Step 4: Simplify right side
   123,375.68x = 12,324,970,761.95
5. Step 5: Solve for x
   x = 12,324,970,761.95/123,375.68
6. Step 6: Final answer
   x = 99,897.89