Finding the Fourth Proportional to 2,867.40, 3,956.04 and 1,820.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,867.40 : 3,956.04 = 1,820.07 : x
2. Step 2: Convert to fraction form
   2,867.40/3,956.04 = 1,820.07/x
3. Step 3: Cross multiply
   2,867.40x = 3,956.04 × 1,820.07
4. Step 4: Simplify right side
   2,867.40x = 7,200,269.72
5. Step 5: Solve for x
   x = 7,200,269.72/2,867.40
6. Step 6: Final answer
   x = 2,511.08