Finding the Third Proportional to 400,657.50 and 816,156

Step by Step Solution

1. Step 1: Write the proportion equation
   400,657.50 : 816,156 = 816,156 : x
2. Step 2: Convert to fraction form
   400,657.50/816,156 = 816,156/x
3. Step 3: Cross multiply
   400,657.50x = 816,156 × 816,156
4. Step 4: Simplify right side
   400,657.50x = 666,110,616,336
5. Step 5: Solve for x
   x = 666,110,616,336/400,657.50
6. Step 6: Final answer
   x = 1,662,543.73