Finding the Fourth Proportional to 8,621.30, 12,956.17 and 5,111.81

Step by Step Solution

1. Step 1: Write the proportion equation
   8,621.30 : 12,956.17 = 5,111.81 : x
2. Step 2: Convert to fraction form
   8,621.30/12,956.17 = 5,111.81/x
3. Step 3: Cross multiply
   8,621.30x = 12,956.17 × 5,111.81
4. Step 4: Simplify right side
   8,621.30x = 66,229,479.37
5. Step 5: Solve for x
   x = 66,229,479.37/8,621.30
6. Step 6: Final answer
   x = 7,682.08