Finding the Fourth Proportional to 6,111.56, 9,170.94 and 5,615.72

Step by Step Solution

1. Step 1: Write the proportion equation
   6,111.56 : 9,170.94 = 5,615.72 : x
2. Step 2: Convert to fraction form
   6,111.56/9,170.94 = 5,615.72/x
3. Step 3: Cross multiply
   6,111.56x = 9,170.94 × 5,615.72
4. Step 4: Simplify right side
   6,111.56x = 51,501,431.18
5. Step 5: Solve for x
   x = 51,501,431.18/6,111.56
6. Step 6: Final answer
   x = 8,426.89