Finding the Fourth Proportional to 2,155.05, 3,231.77 and 693.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.05 : 3,231.77 = 693.81 : x
2. Step 2: Convert to fraction form
   2,155.05/3,231.77 = 693.81/x
3. Step 3: Cross multiply
   2,155.05x = 3,231.77 × 693.81
4. Step 4: Simplify right side
   2,155.05x = 2,242,240.69
5. Step 5: Solve for x
   x = 2,242,240.69/2,155.05
6. Step 6: Final answer
   x = 1,040.46