Finding the Fourth Proportional to 21,123.23, 31,684.77 and 5,328.31

Step by Step Solution

1. Step 1: Write the proportion equation
   21,123.23 : 31,684.77 = 5,328.31 : x
2. Step 2: Convert to fraction form
   21,123.23/31,684.77 = 5,328.31/x
3. Step 3: Cross multiply
   21,123.23x = 31,684.77 × 5,328.31
4. Step 4: Simplify right side
   21,123.23x = 168,826,167.92
5. Step 5: Solve for x
   x = 168,826,167.92/21,123.23
6. Step 6: Final answer
   x = 7,992.44