Finding the Third Proportional to 285.08 and 426.52

Step by Step Solution

1. Step 1: Write the proportion equation
   285.08 : 426.52 = 426.52 : x
2. Step 2: Convert to fraction form
   285.08/426.52 = 426.52/x
3. Step 3: Cross multiply
   285.08x = 426.52 × 426.52
4. Step 4: Simplify right side
   285.08x = 181,915.58
5. Step 5: Solve for x
   x = 181,915.58/285.08
6. Step 6: Final answer
   x = 638.12