Finding the Third Proportional to 259,048.50 and 610,642.50

Step by Step Solution

1. Step 1: Write the proportion equation
   259,048.50 : 610,642.50 = 610,642.50 : x
2. Step 2: Convert to fraction form
   259,048.50/610,642.50 = 610,642.50/x
3. Step 3: Cross multiply
   259,048.50x = 610,642.50 × 610,642.50
4. Step 4: Simplify right side
   259,048.50x = 372,884,262,806.25
5. Step 5: Solve for x
   x = 372,884,262,806.25/259,048.50
6. Step 6: Final answer
   x = 1,439,438.03