Finding the Fourth Proportional to 18,620.40, 25,687.59 and 16,498.10

Step by Step Solution

1. Step 1: Write the proportion equation
   18,620.40 : 25,687.59 = 16,498.10 : x
2. Step 2: Convert to fraction form
   18,620.40/25,687.59 = 16,498.10/x
3. Step 3: Cross multiply
   18,620.40x = 25,687.59 × 16,498.10
4. Step 4: Simplify right side
   18,620.40x = 423,796,300.14
5. Step 5: Solve for x
   x = 423,796,300.14/18,620.40
6. Step 6: Final answer
   x = 22,759.78