Finding the Third Proportional to 400,801.50 and 816,385.50

Step by Step Solution

1. Step 1: Write the proportion equation
   400,801.50 : 816,385.50 = 816,385.50 : x
2. Step 2: Convert to fraction form
   400,801.50/816,385.50 = 816,385.50/x
3. Step 3: Cross multiply
   400,801.50x = 816,385.50 × 816,385.50
4. Step 4: Simplify right side
   400,801.50x = 666,485,284,610.25
5. Step 5: Solve for x
   x = 666,485,284,610.25/400,801.50
6. Step 6: Final answer
   x = 1,662,881.21