Finding the Third Proportional to 288.33 and 621.50

Step by Step Solution

1. Step 1: Write the proportion equation
   288.33 : 621.50 = 621.50 : x
2. Step 2: Convert to fraction form
   288.33/621.50 = 621.50/x
3. Step 3: Cross multiply
   288.33x = 621.50 × 621.50
4. Step 4: Simplify right side
   288.33x = 386,263.46
5. Step 5: Solve for x
   x = 386,263.46/288.33
6. Step 6: Final answer
   x = 1,339.68