Finding the Fourth Proportional to 17,105.38, 25,661.31 and 5,420.32

Step by Step Solution

1. Step 1: Write the proportion equation
   17,105.38 : 25,661.31 = 5,420.32 : x
2. Step 2: Convert to fraction form
   17,105.38/25,661.31 = 5,420.32/x
3. Step 3: Cross multiply
   17,105.38x = 25,661.31 × 5,420.32
4. Step 4: Simplify right side
   17,105.38x = 139,092,511.82
5. Step 5: Solve for x
   x = 139,092,511.82/17,105.38
6. Step 6: Final answer
   x = 8,131.51