Finding the Fourth Proportional to 21,308.90, 31,963.31 and 5,726.53

Step by Step Solution

1. Step 1: Write the proportion equation
   21,308.90 : 31,963.31 = 5,726.53 : x
2. Step 2: Convert to fraction form
   21,308.90/31,963.31 = 5,726.53/x
3. Step 3: Cross multiply
   21,308.90x = 31,963.31 × 5,726.53
4. Step 4: Simplify right side
   21,308.90x = 183,038,665.17
5. Step 5: Solve for x
   x = 183,038,665.17/21,308.90
6. Step 6: Final answer
   x = 8,589.78