Finding the Fourth Proportional to 2,158.50, 3,237.78 and 771.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158.50 : 3,237.78 = 771.92 : x
2. Step 2: Convert to fraction form
   2,158.50/3,237.78 = 771.92/x
3. Step 3: Cross multiply
   2,158.50x = 3,237.78 × 771.92
4. Step 4: Simplify right side
   2,158.50x = 2,499,315.23
5. Step 5: Solve for x
   x = 2,499,315.23/2,158.50
6. Step 6: Final answer
   x = 1,157.89