Finding the Fourth Proportional to 11,091.42, 16,628.91 and 5,241.20

Step by Step Solution

1. Step 1: Write the proportion equation
   11,091.42 : 16,628.91 = 5,241.20 : x
2. Step 2: Convert to fraction form
   11,091.42/16,628.91 = 5,241.20/x
3. Step 3: Cross multiply
   11,091.42x = 16,628.91 × 5,241.20
4. Step 4: Simplify right side
   11,091.42x = 87,155,359.95
5. Step 5: Solve for x
   x = 87,155,359.95/11,091.42
6. Step 6: Final answer
   x = 7,857.91