Finding the Third Proportional to 647,136 and 1,418,688

Step by Step Solution

1. Step 1: Write the proportion equation
   647,136 : 1,418,688 = 1,418,688 : x
2. Step 2: Convert to fraction form
   647,136/1,418,688 = 1,418,688/x
3. Step 3: Cross multiply
   647,136x = 1,418,688 × 1,418,688
4. Step 4: Simplify right side
   647,136x = 2,012,675,641,344
5. Step 5: Solve for x
   x = 2,012,675,641,344/647,136
6. Step 6: Final answer
   x = 3,110,127.77