Finding the Third Proportional to 728,146 and 1,139,740

Step by Step Solution

1. Step 1: Write the proportion equation
   728,146 : 1,139,740 = 1,139,740 : x
2. Step 2: Convert to fraction form
   728,146/1,139,740 = 1,139,740/x
3. Step 3: Cross multiply
   728,146x = 1,139,740 × 1,139,740
4. Step 4: Simplify right side
   728,146x = 1,299,007,267,600
5. Step 5: Solve for x
   x = 1,299,007,267,600/728,146
6. Step 6: Final answer
   x = 1,783,992.86