Finding the Third Proportional to 3,640.78 and 7,800.05

Step by Step Solution

1. Step 1: Write the proportion equation
   3,640.78 : 7,800.05 = 7,800.05 : x
2. Step 2: Convert to fraction form
   3,640.78/7,800.05 = 7,800.05/x
3. Step 3: Cross multiply
   3,640.78x = 7,800.05 × 7,800.05
4. Step 4: Simplify right side
   3,640.78x = 60,840,731.25
5. Step 5: Solve for x
   x = 60,840,731.25/3,640.78
6. Step 6: Final answer
   x = 16,710.90