Finding the Fourth Proportional to 8,889.72, 12,267.96 and 4,911.21

Step by Step Solution

1. Step 1: Write the proportion equation
   8,889.72 : 12,267.96 = 4,911.21 : x
2. Step 2: Convert to fraction form
   8,889.72/12,267.96 = 4,911.21/x
3. Step 3: Cross multiply
   8,889.72x = 12,267.96 × 4,911.21
4. Step 4: Simplify right side
   8,889.72x = 60,250,527.83
5. Step 5: Solve for x
   x = 60,250,527.83/8,889.72
6. Step 6: Final answer
   x = 6,777.55