Finding the Third Proportional to 575,661 and 805,216.50

Step by Step Solution

1. Step 1: Write the proportion equation
   575,661 : 805,216.50 = 805,216.50 : x
2. Step 2: Convert to fraction form
   575,661/805,216.50 = 805,216.50/x
3. Step 3: Cross multiply
   575,661x = 805,216.50 × 805,216.50
4. Step 4: Simplify right side
   575,661x = 648,373,611,872.25
5. Step 5: Solve for x
   x = 648,373,611,872.25/575,661
6. Step 6: Final answer
   x = 1,126,311.51