Finding the Fourth Proportional to 17,118.38, 25,678.30 and 5,431.34

Step by Step Solution

1. Step 1: Write the proportion equation
   17,118.38 : 25,678.30 = 5,431.34 : x
2. Step 2: Convert to fraction form
   17,118.38/25,678.30 = 5,431.34/x
3. Step 3: Cross multiply
   17,118.38x = 25,678.30 × 5,431.34
4. Step 4: Simplify right side
   17,118.38x = 139,467,577.92
5. Step 5: Solve for x
   x = 139,467,577.92/17,118.38
6. Step 6: Final answer
   x = 8,147.24