Finding the Fourth Proportional to 21,086.98, 31,620.05 and 7,042.19

Step by Step Solution

1. Step 1: Write the proportion equation
   21,086.98 : 31,620.05 = 7,042.19 : x
2. Step 2: Convert to fraction form
   21,086.98/31,620.05 = 7,042.19/x
3. Step 3: Cross multiply
   21,086.98x = 31,620.05 × 7,042.19
4. Step 4: Simplify right side
   21,086.98x = 222,674,391.06
5. Step 5: Solve for x
   x = 222,674,391.06/21,086.98
6. Step 6: Final answer
   x = 10,559.80