Finding the Fourth Proportional to 31,072.80, 42,879.02 and 17,642.18

Step by Step Solution

1. Step 1: Write the proportion equation
   31,072.80 : 42,879.02 = 17,642.18 : x
2. Step 2: Convert to fraction form
   31,072.80/42,879.02 = 17,642.18/x
3. Step 3: Cross multiply
   31,072.80x = 42,879.02 × 17,642.18
4. Step 4: Simplify right side
   31,072.80x = 756,479,389.06
5. Step 5: Solve for x
   x = 756,479,389.06/31,072.80
6. Step 6: Final answer
   x = 24,345.39