Finding the Fourth Proportional to 2,156.29, 3,234.35 and 769.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,156.29 : 3,234.35 = 769.30 : x
2. Step 2: Convert to fraction form
   2,156.29/3,234.35 = 769.30/x
3. Step 3: Cross multiply
   2,156.29x = 3,234.35 × 769.30
4. Step 4: Simplify right side
   2,156.29x = 2,488,179.29
5. Step 5: Solve for x
   x = 2,488,179.29/2,156.29
6. Step 6: Final answer
   x = 1,153.92