Finding the Third Proportional to 287,217.50 and 402,483.50

Step by Step Solution

1. Step 1: Write the proportion equation
   287,217.50 : 402,483.50 = 402,483.50 : x
2. Step 2: Convert to fraction form
   287,217.50/402,483.50 = 402,483.50/x
3. Step 3: Cross multiply
   287,217.50x = 402,483.50 × 402,483.50
4. Step 4: Simplify right side
   287,217.50x = 161,992,967,772.25
5. Step 5: Solve for x
   x = 161,992,967,772.25/287,217.50
6. Step 6: Final answer
   x = 564,008.00