Finding the Third Proportional to 911,790 and 1,978,128

Step by Step Solution

1. Step 1: Write the proportion equation
   911,790 : 1,978,128 = 1,978,128 : x
2. Step 2: Convert to fraction form
   911,790/1,978,128 = 1,978,128/x
3. Step 3: Cross multiply
   911,790x = 1,978,128 × 1,978,128
4. Step 4: Simplify right side
   911,790x = 3,912,990,384,384
5. Step 5: Solve for x
   x = 3,912,990,384,384/911,790
6. Step 6: Final answer
   x = 4,291,547.82