Finding the Fourth Proportional to 2,155.38, 3,231 and 693.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.38 : 3,231 = 693.50 : x
2. Step 2: Convert to fraction form
   2,155.38/3,231 = 693.50/x
3. Step 3: Cross multiply
   2,155.38x = 3,231 × 693.50
4. Step 4: Simplify right side
   2,155.38x = 2,240,682.35
5. Step 5: Solve for x
   x = 2,240,682.35/2,155.38
6. Step 6: Final answer
   x = 1,039.58