Finding the Fourth Proportional to 2,579.79, 3,870.72 and 936.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,579.79 : 3,870.72 = 936.45 : x
2. Step 2: Convert to fraction form
   2,579.79/3,870.72 = 936.45/x
3. Step 3: Cross multiply
   2,579.79x = 3,870.72 × 936.45
4. Step 4: Simplify right side
   2,579.79x = 3,624,735.74
5. Step 5: Solve for x
   x = 3,624,735.74/2,579.79
6. Step 6: Final answer
   x = 1,405.05