Finding the Fourth Proportional to 2,764.18, 4,146.90 and 816.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,764.18 : 4,146.90 = 816.31 : x
2. Step 2: Convert to fraction form
   2,764.18/4,146.90 = 816.31/x
3. Step 3: Cross multiply
   2,764.18x = 4,146.90 × 816.31
4. Step 4: Simplify right side
   2,764.18x = 3,385,155.94
5. Step 5: Solve for x
   x = 3,385,155.94/2,764.18
6. Step 6: Final answer
   x = 1,224.65