Finding the Fourth Proportional to 21,131.72, 31,697.84 and 5,550.92

Step by Step Solution

1. Step 1: Write the proportion equation
   21,131.72 : 31,697.84 = 5,550.92 : x
2. Step 2: Convert to fraction form
   21,131.72/31,697.84 = 5,550.92/x
3. Step 3: Cross multiply
   21,131.72x = 31,697.84 × 5,550.92
4. Step 4: Simplify right side
   21,131.72x = 175,952,174.01
5. Step 5: Solve for x
   x = 175,952,174.01/21,131.72
6. Step 6: Final answer
   x = 8,326.45