Finding the Third Proportional to 1,116.28 and 1,489.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,116.28 : 1,489.32 = 1,489.32 : x
2. Step 2: Convert to fraction form
   1,116.28/1,489.32 = 1,489.32/x
3. Step 3: Cross multiply
   1,116.28x = 1,489.32 × 1,489.32
4. Step 4: Simplify right side
   1,116.28x = 2,218,086.63
5. Step 5: Solve for x
   x = 2,218,086.63/1,116.28
6. Step 6: Final answer
   x = 1,987.03