Finding the Third Proportional to 2,155.78 and 4,720.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.78 : 4,720.78 = 4,720.78 : x
2. Step 2: Convert to fraction form
   2,155.78/4,720.78 = 4,720.78/x
3. Step 3: Cross multiply
   2,155.78x = 4,720.78 × 4,720.78
4. Step 4: Simplify right side
   2,155.78x = 22,285,775.61
5. Step 5: Solve for x
   x = 22,285,775.61/2,155.78
6. Step 6: Final answer
   x = 10,337.68