Finding the Fourth Proportional to 17,116.31, 25,678.57 and 5,429.53

Step by Step Solution

1. Step 1: Write the proportion equation
   17,116.31 : 25,678.57 = 5,429.53 : x
2. Step 2: Convert to fraction form
   17,116.31/25,678.57 = 5,429.53/x
3. Step 3: Cross multiply
   17,116.31x = 25,678.57 × 5,429.53
4. Step 4: Simplify right side
   17,116.31x = 139,422,594.88
5. Step 5: Solve for x
   x = 139,422,594.88/17,116.31
6. Step 6: Final answer
   x = 8,145.60