Finding the Fourth Proportional to 1,155.15, 1,731.96 and 693.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,155.15 : 1,731.96 = 693.27 : x
2. Step 2: Convert to fraction form
   1,155.15/1,731.96 = 693.27/x
3. Step 3: Cross multiply
   1,155.15x = 1,731.96 × 693.27
4. Step 4: Simplify right side
   1,155.15x = 1,200,715.91
5. Step 5: Solve for x
   x = 1,200,715.91/1,155.15
6. Step 6: Final answer
   x = 1,039.45