Finding the Fourth Proportional to 2,861.02, 3,946.71 and 2,161.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,861.02 : 3,946.71 = 2,161.18 : x
2. Step 2: Convert to fraction form
   2,861.02/3,946.71 = 2,161.18/x
3. Step 3: Cross multiply
   2,861.02x = 3,946.71 × 2,161.18
4. Step 4: Simplify right side
   2,861.02x = 8,529,550.72
5. Step 5: Solve for x
   x = 8,529,550.72/2,861.02
6. Step 6: Final answer
   x = 2,981.30