Finding the Fourth Proportional to 2,421.27, 3,632.54 and 689.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,421.27 : 3,632.54 = 689.90 : x
2. Step 2: Convert to fraction form
   2,421.27/3,632.54 = 689.90/x
3. Step 3: Cross multiply
   2,421.27x = 3,632.54 × 689.90
4. Step 4: Simplify right side
   2,421.27x = 2,506,067.73
5. Step 5: Solve for x
   x = 2,506,067.73/2,421.27
6. Step 6: Final answer
   x = 1,035.02