Finding the Third Proportional to 521,880 and 806,395.50

Step by Step Solution

1. Step 1: Write the proportion equation
   521,880 : 806,395.50 = 806,395.50 : x
2. Step 2: Convert to fraction form
   521,880/806,395.50 = 806,395.50/x
3. Step 3: Cross multiply
   521,880x = 806,395.50 × 806,395.50
4. Step 4: Simplify right side
   521,880x = 650,273,702,420.25
5. Step 5: Solve for x
   x = 650,273,702,420.25/521,880
6. Step 6: Final answer
   x = 1,246,021.50