Finding the Third Proportional to 911,136 and 1,389,168

Step by Step Solution

1. Step 1: Write the proportion equation
   911,136 : 1,389,168 = 1,389,168 : x
2. Step 2: Convert to fraction form
   911,136/1,389,168 = 1,389,168/x
3. Step 3: Cross multiply
   911,136x = 1,389,168 × 1,389,168
4. Step 4: Simplify right side
   911,136x = 1,929,787,732,224
5. Step 5: Solve for x
   x = 1,929,787,732,224/911,136
6. Step 6: Final answer
   x = 2,118,001.85