Finding the Fourth Proportional to 123,424.95, 170,317.51 and 72,439.71

Step by Step Solution

1. Step 1: Write the proportion equation
   123,424.95 : 170,317.51 = 72,439.71 : x
2. Step 2: Convert to fraction form
   123,424.95/170,317.51 = 72,439.71/x
3. Step 3: Cross multiply
   123,424.95x = 170,317.51 × 72,439.71
4. Step 4: Simplify right side
   123,424.95x = 12,337,751,032.32
5. Step 5: Solve for x
   x = 12,337,751,032.32/123,424.95
6. Step 6: Final answer
   x = 99,961.56