Finding the Fourth Proportional to 16,985.20, 25,429.20 and 16,499.20

Step by Step Solution

1. Step 1: Write the proportion equation
   16,985.20 : 25,429.20 = 16,499.20 : x
2. Step 2: Convert to fraction form
   16,985.20/25,429.20 = 16,499.20/x
3. Step 3: Cross multiply
   16,985.20x = 25,429.20 × 16,499.20
4. Step 4: Simplify right side
   16,985.20x = 419,561,456.64
5. Step 5: Solve for x
   x = 419,561,456.64/16,985.20
6. Step 6: Final answer
   x = 24,701.59