Finding the Fourth Proportional to 21,081.22, 31,626.38 and 7,042.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,081.22 : 31,626.38 = 7,042.50 : x
2. Step 2: Convert to fraction form
   21,081.22/31,626.38 = 7,042.50/x
3. Step 3: Cross multiply
   21,081.22x = 31,626.38 × 7,042.50
4. Step 4: Simplify right side
   21,081.22x = 222,728,781.15
5. Step 5: Solve for x
   x = 222,728,781.15/21,081.22
6. Step 6: Final answer
   x = 10,565.27