Finding the Fourth Proportional to 5,111.05, 7,660.56 and 2,921.29

Step by Step Solution

1. Step 1: Write the proportion equation
   5,111.05 : 7,660.56 = 2,921.29 : x
2. Step 2: Convert to fraction form
   5,111.05/7,660.56 = 2,921.29/x
3. Step 3: Cross multiply
   5,111.05x = 7,660.56 × 2,921.29
4. Step 4: Simplify right side
   5,111.05x = 22,378,717.32
5. Step 5: Solve for x
   x = 22,378,717.32/5,111.05
6. Step 6: Final answer
   x = 4,378.50