Finding the Fourth Proportional to 1,391.08, 1,919.74 and 949.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.08 : 1,919.74 = 949.18 : x
2. Step 2: Convert to fraction form
   1,391.08/1,919.74 = 949.18/x
3. Step 3: Cross multiply
   1,391.08x = 1,919.74 × 949.18
4. Step 4: Simplify right side
   1,391.08x = 1,822,178.81
5. Step 5: Solve for x
   x = 1,822,178.81/1,391.08
6. Step 6: Final answer
   x = 1,309.90