Finding the Third Proportional to 1,128.38 and 1,330.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.38 : 1,330.88 = 1,330.88 : x
2. Step 2: Convert to fraction form
   1,128.38/1,330.88 = 1,330.88/x
3. Step 3: Cross multiply
   1,128.38x = 1,330.88 × 1,330.88
4. Step 4: Simplify right side
   1,128.38x = 1,771,228.27
5. Step 5: Solve for x
   x = 1,771,228.27/1,128.38
6. Step 6: Final answer
   x = 1,569.72