Finding the Fourth Proportional to 123,395.31, 170,275.23 and 72,402.75

Step by Step Solution

1. Step 1: Write the proportion equation
   123,395.31 : 170,275.23 = 72,402.75 : x
2. Step 2: Convert to fraction form
   123,395.31/170,275.23 = 72,402.75/x
3. Step 3: Cross multiply
   123,395.31x = 170,275.23 × 72,402.75
4. Step 4: Simplify right side
   123,395.31x = 12,328,394,908.88
5. Step 5: Solve for x
   x = 12,328,394,908.88/123,395.31
6. Step 6: Final answer
   x = 99,909.75