Finding the Third Proportional to 728,144 and 1,139,736

Step by Step Solution

1. Step 1: Write the proportion equation
   728,144 : 1,139,736 = 1,139,736 : x
2. Step 2: Convert to fraction form
   728,144/1,139,736 = 1,139,736/x
3. Step 3: Cross multiply
   728,144x = 1,139,736 × 1,139,736
4. Step 4: Simplify right side
   728,144x = 1,298,998,149,696
5. Step 5: Solve for x
   x = 1,298,998,149,696/728,144
6. Step 6: Final answer
   x = 1,783,985.24