Finding the Fourth Proportional to 13,758.28, 18,976.71 and 8,456.02

Step by Step Solution

1. Step 1: Write the proportion equation
   13,758.28 : 18,976.71 = 8,456.02 : x
2. Step 2: Convert to fraction form
   13,758.28/18,976.71 = 8,456.02/x
3. Step 3: Cross multiply
   13,758.28x = 18,976.71 × 8,456.02
4. Step 4: Simplify right side
   13,758.28x = 160,467,439.29
5. Step 5: Solve for x
   x = 160,467,439.29/13,758.28
6. Step 6: Final answer
   x = 11,663.34