Finding the Third Proportional to 258,787 and 563,136.50

Step by Step Solution

1. Step 1: Write the proportion equation
   258,787 : 563,136.50 = 563,136.50 : x
2. Step 2: Convert to fraction form
   258,787/563,136.50 = 563,136.50/x
3. Step 3: Cross multiply
   258,787x = 563,136.50 × 563,136.50
4. Step 4: Simplify right side
   258,787x = 317,122,717,632.25
5. Step 5: Solve for x
   x = 317,122,717,632.25/258,787
6. Step 6: Final answer
   x = 1,225,419.81