Finding the Fourth Proportional to 13,285.50, 18,333.88 and 7,911.62

Step by Step Solution

1. Step 1: Write the proportion equation
   13,285.50 : 18,333.88 = 7,911.62 : x
2. Step 2: Convert to fraction form
   13,285.50/18,333.88 = 7,911.62/x
3. Step 3: Cross multiply
   13,285.50x = 18,333.88 × 7,911.62
4. Step 4: Simplify right side
   13,285.50x = 145,050,691.69
5. Step 5: Solve for x
   x = 145,050,691.69/13,285.50
6. Step 6: Final answer
   x = 10,917.97