Finding the Fourth Proportional to 13,410.72, 18,510.38 and 8,371.91

Step by Step Solution

1. Step 1: Write the proportion equation
   13,410.72 : 18,510.38 = 8,371.91 : x
2. Step 2: Convert to fraction form
   13,410.72/18,510.38 = 8,371.91/x
3. Step 3: Cross multiply
   13,410.72x = 18,510.38 × 8,371.91
4. Step 4: Simplify right side
   13,410.72x = 154,967,235.43
5. Step 5: Solve for x
   x = 154,967,235.43/13,410.72
6. Step 6: Final answer
   x = 11,555.47