Finding the Third Proportional to 1,912.97 and 3,928.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,912.97 : 3,928.78 = 3,928.78 : x
2. Step 2: Convert to fraction form
   1,912.97/3,928.78 = 3,928.78/x
3. Step 3: Cross multiply
   1,912.97x = 3,928.78 × 3,928.78
4. Step 4: Simplify right side
   1,912.97x = 15,435,322.11
5. Step 5: Solve for x
   x = 15,435,322.11/1,912.97
6. Step 6: Final answer
   x = 8,068.78