Finding the Fourth Proportional to 2,387.14, 3,579.85 and 826.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,387.14 : 3,579.85 = 826.72 : x
2. Step 2: Convert to fraction form
   2,387.14/3,579.85 = 826.72/x
3. Step 3: Cross multiply
   2,387.14x = 3,579.85 × 826.72
4. Step 4: Simplify right side
   2,387.14x = 2,959,533.42
5. Step 5: Solve for x
   x = 2,959,533.42/2,387.14
6. Step 6: Final answer
   x = 1,239.78