Finding the Fourth Proportional to 21,287.50, 31,945.92 and 7,436.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,287.50 : 31,945.92 = 7,436.50 : x
2. Step 2: Convert to fraction form
   21,287.50/31,945.92 = 7,436.50/x
3. Step 3: Cross multiply
   21,287.50x = 31,945.92 × 7,436.50
4. Step 4: Simplify right side
   21,287.50x = 237,565,834.08
5. Step 5: Solve for x
   x = 237,565,834.08/21,287.50
6. Step 6: Final answer
   x = 11,159.87