Finding the Fourth Proportional to 31,121.22, 42,945.57 and 17,690.61

Step by Step Solution

1. Step 1: Write the proportion equation
   31,121.22 : 42,945.57 = 17,690.61 : x
2. Step 2: Convert to fraction form
   31,121.22/42,945.57 = 17,690.61/x
3. Step 3: Cross multiply
   31,121.22x = 42,945.57 × 17,690.61
4. Step 4: Simplify right side
   31,121.22x = 759,733,330.10
5. Step 5: Solve for x
   x = 759,733,330.10/31,121.22
6. Step 6: Final answer
   x = 24,412.07