Finding the Fourth Proportional to 10,871.58, 16,312.85 and 8,103.81

Step by Step Solution

1. Step 1: Write the proportion equation
   10,871.58 : 16,312.85 = 8,103.81 : x
2. Step 2: Convert to fraction form
   10,871.58/16,312.85 = 8,103.81/x
3. Step 3: Cross multiply
   10,871.58x = 16,312.85 × 8,103.81
4. Step 4: Simplify right side
   10,871.58x = 132,196,196.44
5. Step 5: Solve for x
   x = 132,196,196.44/10,871.58
6. Step 6: Final answer
   x = 12,159.80