Finding the Fourth Proportional to 1,074.72, 1,484.28 and 865.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,074.72 : 1,484.28 = 865.59 : x
2. Step 2: Convert to fraction form
   1,074.72/1,484.28 = 865.59/x
3. Step 3: Cross multiply
   1,074.72x = 1,484.28 × 865.59
4. Step 4: Simplify right side
   1,074.72x = 1,284,766.18
5. Step 5: Solve for x
   x = 1,284,766.18/1,074.72
6. Step 6: Final answer
   x = 1,195.45