Finding the Third Proportional to 258,210.50 and 559,300.50

Step by Step Solution

1. Step 1: Write the proportion equation
   258,210.50 : 559,300.50 = 559,300.50 : x
2. Step 2: Convert to fraction form
   258,210.50/559,300.50 = 559,300.50/x
3. Step 3: Cross multiply
   258,210.50x = 559,300.50 × 559,300.50
4. Step 4: Simplify right side
   258,210.50x = 312,817,049,300.25
5. Step 5: Solve for x
   x = 312,817,049,300.25/258,210.50
6. Step 6: Final answer
   x = 1,211,480.75