Finding the Fourth Proportional to 8,989.69, 12,405.83 and 5,011.05

Step by Step Solution

1. Step 1: Write the proportion equation
   8,989.69 : 12,405.83 = 5,011.05 : x
2. Step 2: Convert to fraction form
   8,989.69/12,405.83 = 5,011.05/x
3. Step 3: Cross multiply
   8,989.69x = 12,405.83 × 5,011.05
4. Step 4: Simplify right side
   8,989.69x = 62,166,234.42
5. Step 5: Solve for x
   x = 62,166,234.42/8,989.69
6. Step 6: Final answer
   x = 6,915.28