Finding the Fourth Proportional to 5,155.12, 7,111.56 and 3,057.76

Step by Step Solution

1. Step 1: Write the proportion equation
   5,155.12 : 7,111.56 = 3,057.76 : x
2. Step 2: Convert to fraction form
   5,155.12/7,111.56 = 3,057.76/x
3. Step 3: Cross multiply
   5,155.12x = 7,111.56 × 3,057.76
4. Step 4: Simplify right side
   5,155.12x = 21,745,443.71
5. Step 5: Solve for x
   x = 21,745,443.71/5,155.12
6. Step 6: Final answer
   x = 4,218.22