Finding the Fourth Proportional to 11,013.79, 15,199.11 and 5,978.10

Step by Step Solution

1. Step 1: Write the proportion equation
   11,013.79 : 15,199.11 = 5,978.10 : x
2. Step 2: Convert to fraction form
   11,013.79/15,199.11 = 5,978.10/x
3. Step 3: Cross multiply
   11,013.79x = 15,199.11 × 5,978.10
4. Step 4: Simplify right side
   11,013.79x = 90,861,799.49
5. Step 5: Solve for x
   x = 90,861,799.49/11,013.79
6. Step 6: Final answer
   x = 8,249.82