Finding the Third Proportional to 840,243 and 1,260,978

Step by Step Solution

1. Step 1: Write the proportion equation
   840,243 : 1,260,978 = 1,260,978 : x
2. Step 2: Convert to fraction form
   840,243/1,260,978 = 1,260,978/x
3. Step 3: Cross multiply
   840,243x = 1,260,978 × 1,260,978
4. Step 4: Simplify right side
   840,243x = 1,590,065,516,484
5. Step 5: Solve for x
   x = 1,590,065,516,484/840,243
6. Step 6: Final answer
   x = 1,892,387.70