Finding the Third Proportional to 388,854 and 900,780

Step by Step Solution

1. Step 1: Write the proportion equation
   388,854 : 900,780 = 900,780 : x
2. Step 2: Convert to fraction form
   388,854/900,780 = 900,780/x
3. Step 3: Cross multiply
   388,854x = 900,780 × 900,780
4. Step 4: Simplify right side
   388,854x = 811,404,608,400
5. Step 5: Solve for x
   x = 811,404,608,400/388,854
6. Step 6: Final answer
   x = 2,086,656.20