Finding the Third Proportional to 857,123 and 1,866,631

Step by Step Solution

1. Step 1: Write the proportion equation
   857,123 : 1,866,631 = 1,866,631 : x
2. Step 2: Convert to fraction form
   857,123/1,866,631 = 1,866,631/x
3. Step 3: Cross multiply
   857,123x = 1,866,631 × 1,866,631
4. Step 4: Simplify right side
   857,123x = 3,484,311,290,161
5. Step 5: Solve for x
   x = 3,484,311,290,161/857,123
6. Step 6: Final answer
   x = 4,065,124.01