Finding the Third Proportional to 1,242.56 and 1,377.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,242.56 : 1,377.56 = 1,377.56 : x
2. Step 2: Convert to fraction form
   1,242.56/1,377.56 = 1,377.56/x
3. Step 3: Cross multiply
   1,242.56x = 1,377.56 × 1,377.56
4. Step 4: Simplify right side
   1,242.56x = 1,897,678.44
5. Step 5: Solve for x
   x = 1,897,678.44/1,242.56
6. Step 6: Final answer
   x = 1,527.23