Finding the Fourth Proportional to 8,856.91, 12,218.87 and 5,271.15

Step by Step Solution

1. Step 1: Write the proportion equation
   8,856.91 : 12,218.87 = 5,271.15 : x
2. Step 2: Convert to fraction form
   8,856.91/12,218.87 = 5,271.15/x
3. Step 3: Cross multiply
   8,856.91x = 12,218.87 × 5,271.15
4. Step 4: Simplify right side
   8,856.91x = 64,407,496.60
5. Step 5: Solve for x
   x = 64,407,496.60/8,856.91
6. Step 6: Final answer
   x = 7,272.01