Finding the Fourth Proportional to 9,138.05, 13,707.02 and 2,212.55

Step by Step Solution

1. Step 1: Write the proportion equation
   9,138.05 : 13,707.02 = 2,212.55 : x
2. Step 2: Convert to fraction form
   9,138.05/13,707.02 = 2,212.55/x
3. Step 3: Cross multiply
   9,138.05x = 13,707.02 × 2,212.55
4. Step 4: Simplify right side
   9,138.05x = 30,327,404.10
5. Step 5: Solve for x
   x = 30,327,404.10/9,138.05
6. Step 6: Final answer
   x = 3,318.81