Finding the Fourth Proportional to 1,912.82, 2,869.83 and 816.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,912.82 : 2,869.83 = 816.89 : x
2. Step 2: Convert to fraction form
   1,912.82/2,869.83 = 816.89/x
3. Step 3: Cross multiply
   1,912.82x = 2,869.83 × 816.89
4. Step 4: Simplify right side
   1,912.82x = 2,344,321.08
5. Step 5: Solve for x
   x = 2,344,321.08/1,912.82
6. Step 6: Final answer
   x = 1,225.59