Finding the Third Proportional to 540,990 and 840,978

Step by Step Solution

1. Step 1: Write the proportion equation
   540,990 : 840,978 = 840,978 : x
2. Step 2: Convert to fraction form
   540,990/840,978 = 840,978/x
3. Step 3: Cross multiply
   540,990x = 840,978 × 840,978
4. Step 4: Simplify right side
   540,990x = 707,243,996,484
5. Step 5: Solve for x
   x = 707,243,996,484/540,990
6. Step 6: Final answer
   x = 1,307,314.36