Finding the Fourth Proportional to 1,389.92, 1,919.77 and 1,099.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.92 : 1,919.77 = 1,099.04 : x
2. Step 2: Convert to fraction form
   1,389.92/1,919.77 = 1,099.04/x
3. Step 3: Cross multiply
   1,389.92x = 1,919.77 × 1,099.04
4. Step 4: Simplify right side
   1,389.92x = 2,109,891.67
5. Step 5: Solve for x
   x = 2,109,891.67/1,389.92
6. Step 6: Final answer
   x = 1,518.00