Finding the Fourth Proportional to 3,712.38, 5,123.55 and 2,221.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,712.38 : 5,123.55 = 2,221.12 : x
2. Step 2: Convert to fraction form
   3,712.38/5,123.55 = 2,221.12/x
3. Step 3: Cross multiply
   3,712.38x = 5,123.55 × 2,221.12
4. Step 4: Simplify right side
   3,712.38x = 11,380,019.38
5. Step 5: Solve for x
   x = 11,380,019.38/3,712.38
6. Step 6: Final answer
   x = 3,065.42