Finding the Third Proportional to 287,280 and 624,307.50

Step by Step Solution

1. Step 1: Write the proportion equation
   287,280 : 624,307.50 = 624,307.50 : x
2. Step 2: Convert to fraction form
   287,280/624,307.50 = 624,307.50/x
3. Step 3: Cross multiply
   287,280x = 624,307.50 × 624,307.50
4. Step 4: Simplify right side
   287,280x = 389,759,854,556.25
5. Step 5: Solve for x
   x = 389,759,854,556.25/287,280
6. Step 6: Final answer
   x = 1,356,724.64