Finding the Fourth Proportional to 3,813.98, 5,714.00 and 2,640.69

Step by Step Solution

1. Step 1: Write the proportion equation
   3,813.98 : 5,714.00 = 2,640.69 : x
2. Step 2: Convert to fraction form
   3,813.98/5,714.00 = 2,640.69/x
3. Step 3: Cross multiply
   3,813.98x = 5,714.00 × 2,640.69
4. Step 4: Simplify right side
   3,813.98x = 15,088,889.46
5. Step 5: Solve for x
   x = 15,088,889.46/3,813.98
6. Step 6: Final answer
   x = 3,956.21