Finding the Third Proportional to 275.48 and 611.72

Step by Step Solution

1. Step 1: Write the proportion equation
   275.48 : 611.72 = 611.72 : x
2. Step 2: Convert to fraction form
   275.48/611.72 = 611.72/x
3. Step 3: Cross multiply
   275.48x = 611.72 × 611.72
4. Step 4: Simplify right side
   275.48x = 374,199.83
5. Step 5: Solve for x
   x = 374,199.83/275.48
6. Step 6: Final answer
   x = 1,358.33