Finding the Fourth Proportional to 13,662.72, 20,499.08 and 5,767.20

Step by Step Solution

1. Step 1: Write the proportion equation
   13,662.72 : 20,499.08 = 5,767.20 : x
2. Step 2: Convert to fraction form
   13,662.72/20,499.08 = 5,767.20/x
3. Step 3: Cross multiply
   13,662.72x = 20,499.08 × 5,767.20
4. Step 4: Simplify right side
   13,662.72x = 118,222,265.34
5. Step 5: Solve for x
   x = 118,222,265.34/13,662.72
6. Step 6: Final answer
   x = 8,652.91