Finding the Fourth Proportional to 13,111.34, 18,090.86 and 8,863.07

Step by Step Solution

1. Step 1: Write the proportion equation
   13,111.34 : 18,090.86 = 8,863.07 : x
2. Step 2: Convert to fraction form
   13,111.34/18,090.86 = 8,863.07/x
3. Step 3: Cross multiply
   13,111.34x = 18,090.86 × 8,863.07
4. Step 4: Simplify right side
   13,111.34x = 160,340,423.77
5. Step 5: Solve for x
   x = 160,340,423.77/13,111.34
6. Step 6: Final answer
   x = 12,229.15