Finding the Third Proportional to 133.73 and 287.72

Step by Step Solution

1. Step 1: Write the proportion equation
   133.73 : 287.72 = 287.72 : x
2. Step 2: Convert to fraction form
   133.73/287.72 = 287.72/x
3. Step 3: Cross multiply
   133.73x = 287.72 × 287.72
4. Step 4: Simplify right side
   133.73x = 82,782.08
5. Step 5: Solve for x
   x = 82,782.08/133.73
6. Step 6: Final answer
   x = 619.00