Finding the Fourth Proportional to 21,022.61, 31,533 and 5,227.31

Step by Step Solution

1. Step 1: Write the proportion equation
   21,022.61 : 31,533 = 5,227.31 : x
2. Step 2: Convert to fraction form
   21,022.61/31,533 = 5,227.31/x
3. Step 3: Cross multiply
   21,022.61x = 31,533 × 5,227.31
4. Step 4: Simplify right side
   21,022.61x = 164,832,766.23
5. Step 5: Solve for x
   x = 164,832,766.23/21,022.61
6. Step 6: Final answer
   x = 7,840.74