Finding the Third Proportional to 309,748 and 455,550

Step by Step Solution

1. Step 1: Write the proportion equation
   309,748 : 455,550 = 455,550 : x
2. Step 2: Convert to fraction form
   309,748/455,550 = 455,550/x
3. Step 3: Cross multiply
   309,748x = 455,550 × 455,550
4. Step 4: Simplify right side
   309,748x = 207,525,802,500
5. Step 5: Solve for x
   x = 207,525,802,500/309,748
6. Step 6: Final answer
   x = 669,982.70