Finding the Fourth Proportional to 4,886.72, 7,321.25 and 4,111.55

Step by Step Solution

1. Step 1: Write the proportion equation
   4,886.72 : 7,321.25 = 4,111.55 : x
2. Step 2: Convert to fraction form
   4,886.72/7,321.25 = 4,111.55/x
3. Step 3: Cross multiply
   4,886.72x = 7,321.25 × 4,111.55
4. Step 4: Simplify right side
   4,886.72x = 30,101,628.27
5. Step 5: Solve for x
   x = 30,101,628.27/4,886.72
6. Step 6: Final answer
   x = 6,159.89