Finding the Fourth Proportional to 13,666.09, 20,499.23 and 3,806.10

Step by Step Solution

1. Step 1: Write the proportion equation
   13,666.09 : 20,499.23 = 3,806.10 : x
2. Step 2: Convert to fraction form
   13,666.09/20,499.23 = 3,806.10/x
3. Step 3: Cross multiply
   13,666.09x = 20,499.23 × 3,806.10
4. Step 4: Simplify right side
   13,666.09x = 78,022,119.30
5. Step 5: Solve for x
   x = 78,022,119.30/13,666.09
6. Step 6: Final answer
   x = 5,709.18