Finding the Third Proportional to 728,108 and 1,139,687

Step by Step Solution

1. Step 1: Write the proportion equation
   728,108 : 1,139,687 = 1,139,687 : x
2. Step 2: Convert to fraction form
   728,108/1,139,687 = 1,139,687/x
3. Step 3: Cross multiply
   728,108x = 1,139,687 × 1,139,687
4. Step 4: Simplify right side
   728,108x = 1,298,886,457,969
5. Step 5: Solve for x
   x = 1,298,886,457,969/728,108
6. Step 6: Final answer
   x = 1,783,920.05