Finding the Third Proportional to 978,920 and 1,378,557

Step by Step Solution

1. Step 1: Write the proportion equation
   978,920 : 1,378,557 = 1,378,557 : x
2. Step 2: Convert to fraction form
   978,920/1,378,557 = 1,378,557/x
3. Step 3: Cross multiply
   978,920x = 1,378,557 × 1,378,557
4. Step 4: Simplify right side
   978,920x = 1,900,419,402,249
5. Step 5: Solve for x
   x = 1,900,419,402,249/978,920
6. Step 6: Final answer
   x = 1,941,342.91