Finding the Third Proportional to 917,212 and 1,321,128

Step by Step Solution

1. Step 1: Write the proportion equation
   917,212 : 1,321,128 = 1,321,128 : x
2. Step 2: Convert to fraction form
   917,212/1,321,128 = 1,321,128/x
3. Step 3: Cross multiply
   917,212x = 1,321,128 × 1,321,128
4. Step 4: Simplify right side
   917,212x = 1,745,379,192,384
5. Step 5: Solve for x
   x = 1,745,379,192,384/917,212
6. Step 6: Final answer
   x = 1,902,917.96