Finding the Fourth Proportional to 2,156.56, 3,234.12 and 769.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,156.56 : 3,234.12 = 769.72 : x
2. Step 2: Convert to fraction form
   2,156.56/3,234.12 = 769.72/x
3. Step 3: Cross multiply
   2,156.56x = 3,234.12 × 769.72
4. Step 4: Simplify right side
   2,156.56x = 2,489,366.85
5. Step 5: Solve for x
   x = 2,489,366.85/2,156.56
6. Step 6: Final answer
   x = 1,154.32