Finding the Fourth Proportional to 2,390.72, 3,584.25 and 1,091.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,390.72 : 3,584.25 = 1,091.28 : x
2. Step 2: Convert to fraction form
   2,390.72/3,584.25 = 1,091.28/x
3. Step 3: Cross multiply
   2,390.72x = 3,584.25 × 1,091.28
4. Step 4: Simplify right side
   2,390.72x = 3,911,420.34
5. Step 5: Solve for x
   x = 3,911,420.34/2,390.72
6. Step 6: Final answer
   x = 1,636.08