Finding the Fourth Proportional to 6,111.21, 8,491.74 and 6,086.61

Step by Step Solution

1. Step 1: Write the proportion equation
   6,111.21 : 8,491.74 = 6,086.61 : x
2. Step 2: Convert to fraction form
   6,111.21/8,491.74 = 6,086.61/x
3. Step 3: Cross multiply
   6,111.21x = 8,491.74 × 6,086.61
4. Step 4: Simplify right side
   6,111.21x = 51,685,886.78
5. Step 5: Solve for x
   x = 51,685,886.78/6,111.21
6. Step 6: Final answer
   x = 8,457.55