Finding the Fourth Proportional to 11,409.40, 17,113.86 and 5,253.40

Step by Step Solution

1. Step 1: Write the proportion equation
   11,409.40 : 17,113.86 = 5,253.40 : x
2. Step 2: Convert to fraction form
   11,409.40/17,113.86 = 5,253.40/x
3. Step 3: Cross multiply
   11,409.40x = 17,113.86 × 5,253.40
4. Step 4: Simplify right side
   11,409.40x = 89,905,952.12
5. Step 5: Solve for x
   x = 89,905,952.12/11,409.40
6. Step 6: Final answer
   x = 7,879.99