Finding the Third Proportional to 258,219 and 559,315.50

Step by Step Solution

1. Step 1: Write the proportion equation
   258,219 : 559,315.50 = 559,315.50 : x
2. Step 2: Convert to fraction form
   258,219/559,315.50 = 559,315.50/x
3. Step 3: Cross multiply
   258,219x = 559,315.50 × 559,315.50
4. Step 4: Simplify right side
   258,219x = 312,833,828,540.25
5. Step 5: Solve for x
   x = 312,833,828,540.25/258,219
6. Step 6: Final answer
   x = 1,211,505.85