Finding the Fourth Proportional to 2,171.55, 3,016.86 and 2,151.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,171.55 : 3,016.86 = 2,151.30 : x
2. Step 2: Convert to fraction form
   2,171.55/3,016.86 = 2,151.30/x
3. Step 3: Cross multiply
   2,171.55x = 3,016.86 × 2,151.30
4. Step 4: Simplify right side
   2,171.55x = 6,490,170.92
5. Step 5: Solve for x
   x = 6,490,170.92/2,171.55
6. Step 6: Final answer
   x = 2,988.73