Finding the Third Proportional to 342.38 and 520.31

Step by Step Solution

1. Step 1: Write the proportion equation
   342.38 : 520.31 = 520.31 : x
2. Step 2: Convert to fraction form
   342.38/520.31 = 520.31/x
3. Step 3: Cross multiply
   342.38x = 520.31 × 520.31
4. Step 4: Simplify right side
   342.38x = 270,725.10
5. Step 5: Solve for x
   x = 270,725.10/342.38
6. Step 6: Final answer
   x = 790.73