Finding the Fourth Proportional to 123,380.33, 170,254.50 and 72,387.69

Step by Step Solution

1. Step 1: Write the proportion equation
   123,380.33 : 170,254.50 = 72,387.69 : x
2. Step 2: Convert to fraction form
   123,380.33/170,254.50 = 72,387.69/x
3. Step 3: Cross multiply
   123,380.33x = 170,254.50 × 72,387.69
4. Step 4: Simplify right side
   123,380.33x = 12,324,329,967.11
5. Step 5: Solve for x
   x = 12,324,329,967.11/123,380.33
6. Step 6: Final answer
   x = 99,888.94