Finding the Third Proportional to 978,840 and 1,378,440

Step by Step Solution

1. Step 1: Write the proportion equation
   978,840 : 1,378,440 = 1,378,440 : x
2. Step 2: Convert to fraction form
   978,840/1,378,440 = 1,378,440/x
3. Step 3: Cross multiply
   978,840x = 1,378,440 × 1,378,440
4. Step 4: Simplify right side
   978,840x = 1,900,096,833,600
5. Step 5: Solve for x
   x = 1,900,096,833,600/978,840
6. Step 6: Final answer
   x = 1,941,172.03