Finding the Fourth Proportional to 1,439.83, 1,985.39 and 1,107.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.83 : 1,985.39 = 1,107.53 : x
2. Step 2: Convert to fraction form
   1,439.83/1,985.39 = 1,107.53/x
3. Step 3: Cross multiply
   1,439.83x = 1,985.39 × 1,107.53
4. Step 4: Simplify right side
   1,439.83x = 2,198,869.06
5. Step 5: Solve for x
   x = 2,198,869.06/1,439.83
6. Step 6: Final answer
   x = 1,527.18