Finding the Fourth Proportional to 1,660.74, 2,489.72 and 1,111.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,660.74 : 2,489.72 = 1,111.25 : x
2. Step 2: Convert to fraction form
   1,660.74/2,489.72 = 1,111.25/x
3. Step 3: Cross multiply
   1,660.74x = 2,489.72 × 1,111.25
4. Step 4: Simplify right side
   1,660.74x = 2,766,683.35
5. Step 5: Solve for x
   x = 2,766,683.35/1,660.74
6. Step 6: Final answer
   x = 1,665.93