Finding the Third Proportional to 56.43 and 123.40

Step by Step Solution

1. Step 1: Write the proportion equation
   56.43 : 123.40 = 123.40 : x
2. Step 2: Convert to fraction form
   56.43/123.40 = 123.40/x
3. Step 3: Cross multiply
   56.43x = 123.40 × 123.40
4. Step 4: Simplify right side
   56.43x = 15,227.17
5. Step 5: Solve for x
   x = 15,227.17/56.43
6. Step 6: Final answer
   x = 269.86