Finding the Fourth Proportional to 11,409.91, 17,090.59 and 5,478.05

Step by Step Solution

1. Step 1: Write the proportion equation
   11,409.91 : 17,090.59 = 5,478.05 : x
2. Step 2: Convert to fraction form
   11,409.91/17,090.59 = 5,478.05/x
3. Step 3: Cross multiply
   11,409.91x = 17,090.59 × 5,478.05
4. Step 4: Simplify right side
   11,409.91x = 93,623,106.55
5. Step 5: Solve for x
   x = 93,623,106.55/11,409.91
6. Step 6: Final answer
   x = 8,205.42