Finding the Fourth Proportional to 13,771.98, 20,613.24 and 7,438.05

Step by Step Solution

1. Step 1: Write the proportion equation
   13,771.98 : 20,613.24 = 7,438.05 : x
2. Step 2: Convert to fraction form
   13,771.98/20,613.24 = 7,438.05/x
3. Step 3: Cross multiply
   13,771.98x = 20,613.24 × 7,438.05
4. Step 4: Simplify right side
   13,771.98x = 153,322,309.78
5. Step 5: Solve for x
   x = 153,322,309.78/13,771.98
6. Step 6: Final answer
   x = 11,132.92