Finding the Third Proportional to 900,687 and 1,978,521

Step by Step Solution

1. Step 1: Write the proportion equation
   900,687 : 1,978,521 = 1,978,521 : x
2. Step 2: Convert to fraction form
   900,687/1,978,521 = 1,978,521/x
3. Step 3: Cross multiply
   900,687x = 1,978,521 × 1,978,521
4. Step 4: Simplify right side
   900,687x = 3,914,545,347,441
5. Step 5: Solve for x
   x = 3,914,545,347,441/900,687
6. Step 6: Final answer
   x = 4,346,177.25