Finding the Third Proportional to 978,621 and 1,378,120.50

Step by Step Solution

1. Step 1: Write the proportion equation
   978,621 : 1,378,120.50 = 1,378,120.50 : x
2. Step 2: Convert to fraction form
   978,621/1,378,120.50 = 1,378,120.50/x
3. Step 3: Cross multiply
   978,621x = 1,378,120.50 × 1,378,120.50
4. Step 4: Simplify right side
   978,621x = 1,899,216,112,520.25
5. Step 5: Solve for x
   x = 1,899,216,112,520.25/978,621
6. Step 6: Final answer
   x = 1,940,706.48