Finding the Third Proportional to 389,217 and 842,404.50

Step by Step Solution

1. Step 1: Write the proportion equation
   389,217 : 842,404.50 = 842,404.50 : x
2. Step 2: Convert to fraction form
   389,217/842,404.50 = 842,404.50/x
3. Step 3: Cross multiply
   389,217x = 842,404.50 × 842,404.50
4. Step 4: Simplify right side
   389,217x = 709,645,341,620.25
5. Step 5: Solve for x
   x = 709,645,341,620.25/389,217
6. Step 6: Final answer
   x = 1,823,263.99