Finding the Third Proportional to 643,136 and 1,371,705

Step by Step Solution

1. Step 1: Write the proportion equation
   643,136 : 1,371,705 = 1,371,705 : x
2. Step 2: Convert to fraction form
   643,136/1,371,705 = 1,371,705/x
3. Step 3: Cross multiply
   643,136x = 1,371,705 × 1,371,705
4. Step 4: Simplify right side
   643,136x = 1,881,574,607,025
5. Step 5: Solve for x
   x = 1,881,574,607,025/643,136
6. Step 6: Final answer
   x = 2,925,624.76