Finding the Fourth Proportional to 2,845.72, 3,928.89 and 2,181.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,845.72 : 3,928.89 = 2,181.34 : x
2. Step 2: Convert to fraction form
   2,845.72/3,928.89 = 2,181.34/x
3. Step 3: Cross multiply
   2,845.72x = 3,928.89 × 2,181.34
4. Step 4: Simplify right side
   2,845.72x = 8,570,244.91
5. Step 5: Solve for x
   x = 8,570,244.91/2,845.72
6. Step 6: Final answer
   x = 3,011.63