Finding the Fourth Proportional to 2,579.57, 3,869.98 and 824.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,579.57 : 3,869.98 = 824.57 : x
2. Step 2: Convert to fraction form
   2,579.57/3,869.98 = 824.57/x
3. Step 3: Cross multiply
   2,579.57x = 3,869.98 × 824.57
4. Step 4: Simplify right side
   2,579.57x = 3,191,069.41
5. Step 5: Solve for x
   x = 3,191,069.41/2,579.57
6. Step 6: Final answer
   x = 1,237.05