Finding the Fourth Proportional to 12,233.55, 16,878.42 and 8,456.91

Step by Step Solution

1. Step 1: Write the proportion equation
   12,233.55 : 16,878.42 = 8,456.91 : x
2. Step 2: Convert to fraction form
   12,233.55/16,878.42 = 8,456.91/x
3. Step 3: Cross multiply
   12,233.55x = 16,878.42 × 8,456.91
4. Step 4: Simplify right side
   12,233.55x = 142,739,278.88
5. Step 5: Solve for x
   x = 142,739,278.88/12,233.55
6. Step 6: Final answer
   x = 11,667.85