Finding the Fourth Proportional to 2,816.91, 3,884.81 and 1,821.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,816.91 : 3,884.81 = 1,821.15 : x
2. Step 2: Convert to fraction form
   2,816.91/3,884.81 = 1,821.15/x
3. Step 3: Cross multiply
   2,816.91x = 3,884.81 × 1,821.15
4. Step 4: Simplify right side
   2,816.91x = 7,074,812.63
5. Step 5: Solve for x
   x = 7,074,812.63/2,816.91
6. Step 6: Final answer
   x = 2,511.55