Finding the Fourth Proportional to 2,856.04, 3,941.20 and 2,109.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,856.04 : 3,941.20 = 2,109.72 : x
2. Step 2: Convert to fraction form
   2,856.04/3,941.20 = 2,109.72/x
3. Step 3: Cross multiply
   2,856.04x = 3,941.20 × 2,109.72
4. Step 4: Simplify right side
   2,856.04x = 8,314,828.46
5. Step 5: Solve for x
   x = 8,314,828.46/2,856.04
6. Step 6: Final answer
   x = 2,911.31