Finding the Fourth Proportional to 1,668.38, 2,499.32 and 1,089.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,668.38 : 2,499.32 = 1,089.50 : x
2. Step 2: Convert to fraction form
   1,668.38/2,499.32 = 1,089.50/x
3. Step 3: Cross multiply
   1,668.38x = 2,499.32 × 1,089.50
4. Step 4: Simplify right side
   1,668.38x = 2,723,009.14
5. Step 5: Solve for x
   x = 2,723,009.14/1,668.38
6. Step 6: Final answer
   x = 1,632.13