Finding the Third Proportional to 911,168 and 1,389,216

Step by Step Solution

1. Step 1: Write the proportion equation
   911,168 : 1,389,216 = 1,389,216 : x
2. Step 2: Convert to fraction form
   911,168/1,389,216 = 1,389,216/x
3. Step 3: Cross multiply
   911,168x = 1,389,216 × 1,389,216
4. Step 4: Simplify right side
   911,168x = 1,929,921,094,656
5. Step 5: Solve for x
   x = 1,929,921,094,656/911,168
6. Step 6: Final answer
   x = 2,118,073.83