Finding the Third Proportional to 851,815 and 1,821,819

Step by Step Solution

1. Step 1: Write the proportion equation
   851,815 : 1,821,819 = 1,821,819 : x
2. Step 2: Convert to fraction form
   851,815/1,821,819 = 1,821,819/x
3. Step 3: Cross multiply
   851,815x = 1,821,819 × 1,821,819
4. Step 4: Simplify right side
   851,815x = 3,319,024,468,761
5. Step 5: Solve for x
   x = 3,319,024,468,761/851,815
6. Step 6: Final answer
   x = 3,896,414.68