Finding the Fourth Proportional to 13,256.78, 18,294.39 and 7,288.56

Step by Step Solution

1. Step 1: Write the proportion equation
   13,256.78 : 18,294.39 = 7,288.56 : x
2. Step 2: Convert to fraction form
   13,256.78/18,294.39 = 7,288.56/x
3. Step 3: Cross multiply
   13,256.78x = 18,294.39 × 7,288.56
4. Step 4: Simplify right side
   13,256.78x = 133,339,759.18
5. Step 5: Solve for x
   x = 133,339,759.18/13,256.78
6. Step 6: Final answer
   x = 10,058.24