Finding the Fourth Proportional to 1,663.91, 2,496.06 and 690.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,663.91 : 2,496.06 = 690.69 : x
2. Step 2: Convert to fraction form
   1,663.91/2,496.06 = 690.69/x
3. Step 3: Cross multiply
   1,663.91x = 2,496.06 × 690.69
4. Step 4: Simplify right side
   1,663.91x = 1,724,003.68
5. Step 5: Solve for x
   x = 1,724,003.68/1,663.91
6. Step 6: Final answer
   x = 1,036.12