Finding the Third Proportional to 1,665.98 and 3,856.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.98 : 3,856.78 = 3,856.78 : x
2. Step 2: Convert to fraction form
   1,665.98/3,856.78 = 3,856.78/x
3. Step 3: Cross multiply
   1,665.98x = 3,856.78 × 3,856.78
4. Step 4: Simplify right side
   1,665.98x = 14,874,761.61
5. Step 5: Solve for x
   x = 14,874,761.61/1,665.98
6. Step 6: Final answer
   x = 8,928.51