Finding the Fourth Proportional to 8,682.71, 11,978.39 and 5,851.91

Step by Step Solution

1. Step 1: Write the proportion equation
   8,682.71 : 11,978.39 = 5,851.91 : x
2. Step 2: Convert to fraction form
   8,682.71/11,978.39 = 5,851.91/x
3. Step 3: Cross multiply
   8,682.71x = 11,978.39 × 5,851.91
4. Step 4: Simplify right side
   8,682.71x = 70,096,460.22
5. Step 5: Solve for x
   x = 70,096,460.22/8,682.71
6. Step 6: Final answer
   x = 8,073.11