Finding the Third Proportional to 399,568.50 and 849,991.50

Step by Step Solution

1. Step 1: Write the proportion equation
   399,568.50 : 849,991.50 = 849,991.50 : x
2. Step 2: Convert to fraction form
   399,568.50/849,991.50 = 849,991.50/x
3. Step 3: Cross multiply
   399,568.50x = 849,991.50 × 849,991.50
4. Step 4: Simplify right side
   399,568.50x = 722,485,550,072.25
5. Step 5: Solve for x
   x = 722,485,550,072.25/399,568.50
6. Step 6: Final answer
   x = 1,808,164.43