Finding the Third Proportional to 2,173.50 and 2,911.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,173.50 : 2,911.78 = 2,911.78 : x
2. Step 2: Convert to fraction form
   2,173.50/2,911.78 = 2,911.78/x
3. Step 3: Cross multiply
   2,173.50x = 2,911.78 × 2,911.78
4. Step 4: Simplify right side
   2,173.50x = 8,478,470.05
5. Step 5: Solve for x
   x = 8,478,470.05/2,173.50
6. Step 6: Final answer
   x = 3,900.84