Finding the Third Proportional to 309,111 and 651,426

Step by Step Solution

1. Step 1: Write the proportion equation
   309,111 : 651,426 = 651,426 : x
2. Step 2: Convert to fraction form
   309,111/651,426 = 651,426/x
3. Step 3: Cross multiply
   309,111x = 651,426 × 651,426
4. Step 4: Simplify right side
   309,111x = 424,355,833,476
5. Step 5: Solve for x
   x = 424,355,833,476/309,111
6. Step 6: Final answer
   x = 1,372,826.70