Finding the Third Proportional to 123.19 and 260.72

Step by Step Solution

1. Step 1: Write the proportion equation
   123.19 : 260.72 = 260.72 : x
2. Step 2: Convert to fraction form
   123.19/260.72 = 260.72/x
3. Step 3: Cross multiply
   123.19x = 260.72 × 260.72
4. Step 4: Simplify right side
   123.19x = 67,974.27
5. Step 5: Solve for x
   x = 67,974.27/123.19
6. Step 6: Final answer
   x = 551.80