Finding the Fourth Proportional to 15,919.78, 21,962.72 and 9,633.10

Step by Step Solution

1. Step 1: Write the proportion equation
   15,919.78 : 21,962.72 = 9,633.10 : x
2. Step 2: Convert to fraction form
   15,919.78/21,962.72 = 9,633.10/x
3. Step 3: Cross multiply
   15,919.78x = 21,962.72 × 9,633.10
4. Step 4: Simplify right side
   15,919.78x = 211,569,078.03
5. Step 5: Solve for x
   x = 211,569,078.03/15,919.78
6. Step 6: Final answer
   x = 13,289.70