Finding the Third Proportional to 3,640.78 and 4,140.28

Step by Step Solution

1. Step 1: Write the proportion equation
   3,640.78 : 4,140.28 = 4,140.28 : x
2. Step 2: Convert to fraction form
   3,640.78/4,140.28 = 4,140.28/x
3. Step 3: Cross multiply
   3,640.78x = 4,140.28 × 4,140.28
4. Step 4: Simplify right side
   3,640.78x = 17,141,928.83
5. Step 5: Solve for x
   x = 17,141,928.83/3,640.78
6. Step 6: Final answer
   x = 4,708.31