Finding the Third Proportional to 3,910.78 and 9,154.27

Step by Step Solution

1. Step 1: Write the proportion equation
   3,910.78 : 9,154.27 = 9,154.27 : x
2. Step 2: Convert to fraction form
   3,910.78/9,154.27 = 9,154.27/x
3. Step 3: Cross multiply
   3,910.78x = 9,154.27 × 9,154.27
4. Step 4: Simplify right side
   3,910.78x = 83,800,579.13
5. Step 5: Solve for x
   x = 83,800,579.13/3,910.78
6. Step 6: Final answer
   x = 21,428.09