Finding the Third Proportional to 309,116.25 and 651,442.50

Step by Step Solution

1. Step 1: Write the proportion equation
   309,116.25 : 651,442.50 = 651,442.50 : x
2. Step 2: Convert to fraction form
   309,116.25/651,442.50 = 651,442.50/x
3. Step 3: Cross multiply
   309,116.25x = 651,442.50 × 651,442.50
4. Step 4: Simplify right side
   309,116.25x = 424,377,330,806.25
5. Step 5: Solve for x
   x = 424,377,330,806.25/309,116.25
6. Step 6: Final answer
   x = 1,372,872.93