Finding the Fourth Proportional to 5,111.67, 7,054.18 and 3,015.80

Step by Step Solution

1. Step 1: Write the proportion equation
   5,111.67 : 7,054.18 = 3,015.80 : x
2. Step 2: Convert to fraction form
   5,111.67/7,054.18 = 3,015.80/x
3. Step 3: Cross multiply
   5,111.67x = 7,054.18 × 3,015.80
4. Step 4: Simplify right side
   5,111.67x = 21,273,996.04
5. Step 5: Solve for x
   x = 21,273,996.04/5,111.67
6. Step 6: Final answer
   x = 4,161.85