Finding the Fourth Proportional to 13,311.63, 19,960.56 and 10,806.10

Step by Step Solution

1. Step 1: Write the proportion equation
   13,311.63 : 19,960.56 = 10,806.10 : x
2. Step 2: Convert to fraction form
   13,311.63/19,960.56 = 10,806.10/x
3. Step 3: Cross multiply
   13,311.63x = 19,960.56 × 10,806.10
4. Step 4: Simplify right side
   13,311.63x = 215,695,757.51
5. Step 5: Solve for x
   x = 215,695,757.51/13,311.63
6. Step 6: Final answer
   x = 16,203.56