Finding the Third Proportional to 309,142 and 651,492

Step by Step Solution

1. Step 1: Write the proportion equation
   309,142 : 651,492 = 651,492 : x
2. Step 2: Convert to fraction form
   309,142/651,492 = 651,492/x
3. Step 3: Cross multiply
   309,142x = 651,492 × 651,492
4. Step 4: Simplify right side
   309,142x = 424,441,826,064
5. Step 5: Solve for x
   x = 424,441,826,064/309,142
6. Step 6: Final answer
   x = 1,372,967.20