Finding the Fourth Proportional to 21,131.15, 31,697.73 and 17,426.61

Step by Step Solution

1. Step 1: Write the proportion equation
   21,131.15 : 31,697.73 = 17,426.61 : x
2. Step 2: Convert to fraction form
   21,131.15/31,697.73 = 17,426.61/x
3. Step 3: Cross multiply
   21,131.15x = 31,697.73 × 17,426.61
4. Step 4: Simplify right side
   21,131.15x = 552,383,978.60
5. Step 5: Solve for x
   x = 552,383,978.60/21,131.15
6. Step 6: Final answer
   x = 26,140.75