Finding the Fourth Proportional to 15,722.88, 21,696.72 and 8,648.16

Step by Step Solution

1. Step 1: Write the proportion equation
   15,722.88 : 21,696.72 = 8,648.16 : x
2. Step 2: Convert to fraction form
   15,722.88/21,696.72 = 8,648.16/x
3. Step 3: Cross multiply
   15,722.88x = 21,696.72 × 8,648.16
4. Step 4: Simplify right side
   15,722.88x = 187,636,706.04
5. Step 5: Solve for x
   x = 187,636,706.04/15,722.88
6. Step 6: Final answer
   x = 11,933.99