Finding the Fourth Proportional to 2,156.81, 3,234.20 and 923.58

Step by Step Solution

1. Step 1: Write the proportion equation
   2,156.81 : 3,234.20 = 923.58 : x
2. Step 2: Convert to fraction form
   2,156.81/3,234.20 = 923.58/x
3. Step 3: Cross multiply
   2,156.81x = 3,234.20 × 923.58
4. Step 4: Simplify right side
   2,156.81x = 2,987,037.82
5. Step 5: Solve for x
   x = 2,987,037.82/2,156.81
6. Step 6: Final answer
   x = 1,384.94