Finding the Fourth Proportional to 13,411.34, 18,498.80 and 8,623.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,411.34 : 18,498.80 = 8,623.72 : x
2. Step 2: Convert to fraction form
   13,411.34/18,498.80 = 8,623.72/x
3. Step 3: Cross multiply
   13,411.34x = 18,498.80 × 8,623.72
4. Step 4: Simplify right side
   13,411.34x = 159,528,471.54
5. Step 5: Solve for x
   x = 159,528,471.54/13,411.34
6. Step 6: Final answer
   x = 11,895.04