Finding the Fourth Proportional to 21,142.14, 31,471.61 and 20,826.82

Step by Step Solution

1. Step 1: Write the proportion equation
   21,142.14 : 31,471.61 = 20,826.82 : x
2. Step 2: Convert to fraction form
   21,142.14/31,471.61 = 20,826.82/x
3. Step 3: Cross multiply
   21,142.14x = 31,471.61 × 20,826.82
4. Step 4: Simplify right side
   21,142.14x = 655,453,567.93
5. Step 5: Solve for x
   x = 655,453,567.93/21,142.14
6. Step 6: Final answer
   x = 31,002.24