Finding the Third Proportional to 268,281 and 428,665.50

Step by Step Solution

1. Step 1: Write the proportion equation
   268,281 : 428,665.50 = 428,665.50 : x
2. Step 2: Convert to fraction form
   268,281/428,665.50 = 428,665.50/x
3. Step 3: Cross multiply
   268,281x = 428,665.50 × 428,665.50
4. Step 4: Simplify right side
   268,281x = 183,754,110,890.25
5. Step 5: Solve for x
   x = 183,754,110,890.25/268,281
6. Step 6: Final answer
   x = 684,931.51