Finding the Third Proportional to 259,216.50 and 539,131.50

Step by Step Solution

1. Step 1: Write the proportion equation
   259,216.50 : 539,131.50 = 539,131.50 : x
2. Step 2: Convert to fraction form
   259,216.50/539,131.50 = 539,131.50/x
3. Step 3: Cross multiply
   259,216.50x = 539,131.50 × 539,131.50
4. Step 4: Simplify right side
   259,216.50x = 290,662,774,292.25
5. Step 5: Solve for x
   x = 290,662,774,292.25/259,216.50
6. Step 6: Final answer
   x = 1,121,312.78