Finding the Fourth Proportional to 21,174.88, 31,755.33 and 7,131.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,174.88 : 31,755.33 = 7,131.42 : x
2. Step 2: Convert to fraction form
   21,174.88/31,755.33 = 7,131.42/x
3. Step 3: Cross multiply
   21,174.88x = 31,755.33 × 7,131.42
4. Step 4: Simplify right side
   21,174.88x = 226,460,595.47
5. Step 5: Solve for x
   x = 226,460,595.47/21,174.88
6. Step 6: Final answer
   x = 10,694.78