Finding the Fourth Proportional to 1,665.62, 2,496.57 and 1,120.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.62 : 2,496.57 = 1,120.69 : x
2. Step 2: Convert to fraction form
   1,665.62/2,496.57 = 1,120.69/x
3. Step 3: Cross multiply
   1,665.62x = 2,496.57 × 1,120.69
4. Step 4: Simplify right side
   1,665.62x = 2,797,881.03
5. Step 5: Solve for x
   x = 2,797,881.03/1,665.62
6. Step 6: Final answer
   x = 1,679.78