Finding the Fourth Proportional to 123,010.67, 169,797.18 and 72,039.78

Step by Step Solution

1. Step 1: Write the proportion equation
   123,010.67 : 169,797.18 = 72,039.78 : x
2. Step 2: Convert to fraction form
   123,010.67/169,797.18 = 72,039.78/x
3. Step 3: Cross multiply
   123,010.67x = 169,797.18 × 72,039.78
4. Step 4: Simplify right side
   123,010.67x = 12,232,151,491.82
5. Step 5: Solve for x
   x = 12,232,151,491.82/123,010.67
6. Step 6: Final answer
   x = 99,439.76