Finding the Fourth Proportional to 2,209.16, 3,315.50 and 1,170.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,209.16 : 3,315.50 = 1,170.28 : x
2. Step 2: Convert to fraction form
   2,209.16/3,315.50 = 1,170.28/x
3. Step 3: Cross multiply
   2,209.16x = 3,315.50 × 1,170.28
4. Step 4: Simplify right side
   2,209.16x = 3,880,063.34
5. Step 5: Solve for x
   x = 3,880,063.34/2,209.16
6. Step 6: Final answer
   x = 1,756.35