Finding the Fourth Proportional to 9,289.59, 12,819.86 and 5,311.07

Step by Step Solution

1. Step 1: Write the proportion equation
   9,289.59 : 12,819.86 = 5,311.07 : x
2. Step 2: Convert to fraction form
   9,289.59/12,819.86 = 5,311.07/x
3. Step 3: Cross multiply
   9,289.59x = 12,819.86 × 5,311.07
4. Step 4: Simplify right side
   9,289.59x = 68,087,179.34
5. Step 5: Solve for x
   x = 68,087,179.34/9,289.59
6. Step 6: Final answer
   x = 7,329.41