Finding the Fourth Proportional to 10,899.36, 16,209.72 and 10,782.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,899.36 : 16,209.72 = 10,782.72 : x
2. Step 2: Convert to fraction form
   10,899.36/16,209.72 = 10,782.72/x
3. Step 3: Cross multiply
   10,899.36x = 16,209.72 × 10,782.72
4. Step 4: Simplify right side
   10,899.36x = 174,784,872.04
5. Step 5: Solve for x
   x = 174,784,872.04/10,899.36
6. Step 6: Final answer
   x = 16,036.25