Finding the Fourth Proportional to 11,477.39, 17,221.38 and 5,239.31

Step by Step Solution

1. Step 1: Write the proportion equation
   11,477.39 : 17,221.38 = 5,239.31 : x
2. Step 2: Convert to fraction form
   11,477.39/17,221.38 = 5,239.31/x
3. Step 3: Cross multiply
   11,477.39x = 17,221.38 × 5,239.31
4. Step 4: Simplify right side
   11,477.39x = 90,228,062.34
5. Step 5: Solve for x
   x = 90,228,062.34/11,477.39
6. Step 6: Final answer
   x = 7,861.38