Finding the Fourth Proportional to 13,030.38, 17,990.82 and 8,321.04

Step by Step Solution

1. Step 1: Write the proportion equation
   13,030.38 : 17,990.82 = 8,321.04 : x
2. Step 2: Convert to fraction form
   13,030.38/17,990.82 = 8,321.04/x
3. Step 3: Cross multiply
   13,030.38x = 17,990.82 × 8,321.04
4. Step 4: Simplify right side
   13,030.38x = 149,702,332.85
5. Step 5: Solve for x
   x = 149,702,332.85/13,030.38
6. Step 6: Final answer
   x = 11,488.72