Finding the Third Proportional to 287.72 and 615.94

Step by Step Solution

1. Step 1: Write the proportion equation
   287.72 : 615.94 = 615.94 : x
2. Step 2: Convert to fraction form
   287.72/615.94 = 615.94/x
3. Step 3: Cross multiply
   287.72x = 615.94 × 615.94
4. Step 4: Simplify right side
   287.72x = 379,379.00
5. Step 5: Solve for x
   x = 379,379.00/287.72
6. Step 6: Final answer
   x = 1,318.58