Finding the Third Proportional to 728,122.50 and 1,139,710.50

Step by Step Solution

1. Step 1: Write the proportion equation
   728,122.50 : 1,139,710.50 = 1,139,710.50 : x
2. Step 2: Convert to fraction form
   728,122.50/1,139,710.50 = 1,139,710.50/x
3. Step 3: Cross multiply
   728,122.50x = 1,139,710.50 × 1,139,710.50
4. Step 4: Simplify right side
   728,122.50x = 1,298,940,023,810.25
5. Step 5: Solve for x
   x = 1,298,940,023,810.25/728,122.50
6. Step 6: Final answer
   x = 1,783,958.09