Finding the Third Proportional to 287,307 and 624,874.50

Step by Step Solution

1. Step 1: Write the proportion equation
   287,307 : 624,874.50 = 624,874.50 : x
2. Step 2: Convert to fraction form
   287,307/624,874.50 = 624,874.50/x
3. Step 3: Cross multiply
   287,307x = 624,874.50 × 624,874.50
4. Step 4: Simplify right side
   287,307x = 390,468,140,750.25
5. Step 5: Solve for x
   x = 390,468,140,750.25/287,307
6. Step 6: Final answer
   x = 1,359,062.40