Finding the Fourth Proportional to 1,662.21, 2,493.59 and 689.00

Step by Step Solution

1. Step 1: Write the proportion equation
   1,662.21 : 2,493.59 = 689.00 : x
2. Step 2: Convert to fraction form
   1,662.21/2,493.59 = 689.00/x
3. Step 3: Cross multiply
   1,662.21x = 2,493.59 × 689.00
4. Step 4: Simplify right side
   1,662.21x = 1,718,067.60
5. Step 5: Solve for x
   x = 1,718,067.60/1,662.21
6. Step 6: Final answer
   x = 1,033.60