Finding the Third Proportional to 721,105 and 1,120,989

Step by Step Solution

1. Step 1: Write the proportion equation
   721,105 : 1,120,989 = 1,120,989 : x
2. Step 2: Convert to fraction form
   721,105/1,120,989 = 1,120,989/x
3. Step 3: Cross multiply
   721,105x = 1,120,989 × 1,120,989
4. Step 4: Simplify right side
   721,105x = 1,256,616,338,121
5. Step 5: Solve for x
   x = 1,256,616,338,121/721,105
6. Step 6: Final answer
   x = 1,742,626.02