Finding the Third Proportional to 309,753 and 455,557.50

Step by Step Solution

1. Step 1: Write the proportion equation
   309,753 : 455,557.50 = 455,557.50 : x
2. Step 2: Convert to fraction form
   309,753/455,557.50 = 455,557.50/x
3. Step 3: Cross multiply
   309,753x = 455,557.50 × 455,557.50
4. Step 4: Simplify right side
   309,753x = 207,532,635,806.25
5. Step 5: Solve for x
   x = 207,532,635,806.25/309,753
6. Step 6: Final answer
   x = 669,993.95