Finding the Fourth Proportional to 3,171.59, 4,377.60 and 2,111.13

Step by Step Solution

1. Step 1: Write the proportion equation
   3,171.59 : 4,377.60 = 2,111.13 : x
2. Step 2: Convert to fraction form
   3,171.59/4,377.60 = 2,111.13/x
3. Step 3: Cross multiply
   3,171.59x = 4,377.60 × 2,111.13
4. Step 4: Simplify right side
   3,171.59x = 9,241,682.69
5. Step 5: Solve for x
   x = 9,241,682.69/3,171.59
6. Step 6: Final answer
   x = 2,913.90