Finding the Fourth Proportional to 21,236.72, 31,842.12 and 8,752.88

Step by Step Solution

1. Step 1: Write the proportion equation
   21,236.72 : 31,842.12 = 8,752.88 : x
2. Step 2: Convert to fraction form
   21,236.72/31,842.12 = 8,752.88/x
3. Step 3: Cross multiply
   21,236.72x = 31,842.12 × 8,752.88
4. Step 4: Simplify right side
   21,236.72x = 278,710,255.31
5. Step 5: Solve for x
   x = 278,710,255.31/21,236.72
6. Step 6: Final answer
   x = 13,123.98