Finding the Fourth Proportional to 2,787.72, 4,160.79 and 2,667.43

Step by Step Solution

1. Step 1: Write the proportion equation
   2,787.72 : 4,160.79 = 2,667.43 : x
2. Step 2: Convert to fraction form
   2,787.72/4,160.79 = 2,667.43/x
3. Step 3: Cross multiply
   2,787.72x = 4,160.79 × 2,667.43
4. Step 4: Simplify right side
   2,787.72x = 11,098,628.77
5. Step 5: Solve for x
   x = 11,098,628.77/2,787.72
6. Step 6: Final answer
   x = 3,981.26