Finding the Third Proportional to 728,142 and 1,139,733

Step by Step Solution

1. Step 1: Write the proportion equation
   728,142 : 1,139,733 = 1,139,733 : x
2. Step 2: Convert to fraction form
   728,142/1,139,733 = 1,139,733/x
3. Step 3: Cross multiply
   728,142x = 1,139,733 × 1,139,733
4. Step 4: Simplify right side
   728,142x = 1,298,991,311,289
5. Step 5: Solve for x
   x = 1,298,991,311,289/728,142
6. Step 6: Final answer
   x = 1,783,980.75