Finding the Fourth Proportional to 12,506.08, 17,256 and 7,128.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,506.08 : 17,256 = 7,128.42 : x
2. Step 2: Convert to fraction form
   12,506.08/17,256 = 7,128.42/x
3. Step 3: Cross multiply
   12,506.08x = 17,256 × 7,128.42
4. Step 4: Simplify right side
   12,506.08x = 123,008,015.52
5. Step 5: Solve for x
   x = 123,008,015.52/12,506.08
6. Step 6: Final answer
   x = 9,835.86