Finding the Fourth Proportional to 1,665.09, 2,498.04 and 690.66

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.09 : 2,498.04 = 690.66 : x
2. Step 2: Convert to fraction form
   1,665.09/2,498.04 = 690.66/x
3. Step 3: Cross multiply
   1,665.09x = 2,498.04 × 690.66
4. Step 4: Simplify right side
   1,665.09x = 1,725,296.31
5. Step 5: Solve for x
   x = 1,725,296.31/1,665.09
6. Step 6: Final answer
   x = 1,036.16