Finding the Third Proportional to 890,128 and 1,979,272

Step by Step Solution

1. Step 1: Write the proportion equation
   890,128 : 1,979,272 = 1,979,272 : x
2. Step 2: Convert to fraction form
   890,128/1,979,272 = 1,979,272/x
3. Step 3: Cross multiply
   890,128x = 1,979,272 × 1,979,272
4. Step 4: Simplify right side
   890,128x = 3,917,517,649,984
5. Step 5: Solve for x
   x = 3,917,517,649,984/890,128
6. Step 6: Final answer
   x = 4,401,072.26