Finding the Fourth Proportional to 2,372.57, 3,558.89 and 641.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,372.57 : 3,558.89 = 641.20 : x
2. Step 2: Convert to fraction form
   2,372.57/3,558.89 = 641.20/x
3. Step 3: Cross multiply
   2,372.57x = 3,558.89 × 641.20
4. Step 4: Simplify right side
   2,372.57x = 2,281,960.27
5. Step 5: Solve for x
   x = 2,281,960.27/2,372.57
6. Step 6: Final answer
   x = 961.81