Finding the Fourth Proportional to 8,890.72, 12,269.20 and 4,911.86

Step by Step Solution

1. Step 1: Write the proportion equation
   8,890.72 : 12,269.20 = 4,911.86 : x
2. Step 2: Convert to fraction form
   8,890.72/12,269.20 = 4,911.86/x
3. Step 3: Cross multiply
   8,890.72x = 12,269.20 × 4,911.86
4. Step 4: Simplify right side
   8,890.72x = 60,264,519.09
5. Step 5: Solve for x
   x = 60,264,519.09/8,890.72
6. Step 6: Final answer
   x = 6,778.36