Finding the Fourth Proportional to 17,115.78, 25,674.56 and 5,429.90

Step by Step Solution

1. Step 1: Write the proportion equation
   17,115.78 : 25,674.56 = 5,429.90 : x
2. Step 2: Convert to fraction form
   17,115.78/25,674.56 = 5,429.90/x
3. Step 3: Cross multiply
   17,115.78x = 25,674.56 × 5,429.90
4. Step 4: Simplify right side
   17,115.78x = 139,410,293.34
5. Step 5: Solve for x
   x = 139,410,293.34/17,115.78
6. Step 6: Final answer
   x = 8,145.13