Finding the Third Proportional to 291.38 and 426.38

Step by Step Solution

1. Step 1: Write the proportion equation
   291.38 : 426.38 = 426.38 : x
2. Step 2: Convert to fraction form
   291.38/426.38 = 426.38/x
3. Step 3: Cross multiply
   291.38x = 426.38 × 426.38
4. Step 4: Simplify right side
   291.38x = 181,795.64
5. Step 5: Solve for x
   x = 181,795.64/291.38
6. Step 6: Final answer
   x = 623.92