Finding the Fourth Proportional to 3,191.72, 4,792.86 and 2,158.40

Step by Step Solution

1. Step 1: Write the proportion equation
   3,191.72 : 4,792.86 = 2,158.40 : x
2. Step 2: Convert to fraction form
   3,191.72/4,792.86 = 2,158.40/x
3. Step 3: Cross multiply
   3,191.72x = 4,792.86 × 2,158.40
4. Step 4: Simplify right side
   3,191.72x = 10,344,909.02
5. Step 5: Solve for x
   x = 10,344,909.02/3,191.72
6. Step 6: Final answer
   x = 3,241.17