Finding the Fourth Proportional to 11,978.27, 16,530.05 and 7,198.30

Step by Step Solution

1. Step 1: Write the proportion equation
   11,978.27 : 16,530.05 = 7,198.30 : x
2. Step 2: Convert to fraction form
   11,978.27/16,530.05 = 7,198.30/x
3. Step 3: Cross multiply
   11,978.27x = 16,530.05 × 7,198.30
4. Step 4: Simplify right side
   11,978.27x = 118,988,140.27
5. Step 5: Solve for x
   x = 118,988,140.27/11,978.27
6. Step 6: Final answer
   x = 9,933.67