Finding the Third Proportional to 133.59 and 287.16

Step by Step Solution

1. Step 1: Write the proportion equation
   133.59 : 287.16 = 287.16 : x
2. Step 2: Convert to fraction form
   133.59/287.16 = 287.16/x
3. Step 3: Cross multiply
   133.59x = 287.16 × 287.16
4. Step 4: Simplify right side
   133.59x = 82,458.71
5. Step 5: Solve for x
   x = 82,458.71/133.59
6. Step 6: Final answer
   x = 617.23