Finding the Fourth Proportional to 17,120.84, 25,684.29 and 5,431.32

Step by Step Solution

1. Step 1: Write the proportion equation
   17,120.84 : 25,684.29 = 5,431.32 : x
2. Step 2: Convert to fraction form
   17,120.84/25,684.29 = 5,431.32/x
3. Step 3: Cross multiply
   17,120.84x = 25,684.29 × 5,431.32
4. Step 4: Simplify right side
   17,120.84x = 139,499,597.96
5. Step 5: Solve for x
   x = 139,499,597.96/17,120.84
6. Step 6: Final answer
   x = 8,147.94