Finding the Third Proportional to 259,789.50 and 539,995.50

Step by Step Solution

1. Step 1: Write the proportion equation
   259,789.50 : 539,995.50 = 539,995.50 : x
2. Step 2: Convert to fraction form
   259,789.50/539,995.50 = 539,995.50/x
3. Step 3: Cross multiply
   259,789.50x = 539,995.50 × 539,995.50
4. Step 4: Simplify right side
   259,789.50x = 291,595,140,020.25
5. Step 5: Solve for x
   x = 291,595,140,020.25/259,789.50
6. Step 6: Final answer
   x = 1,122,428.50