Finding the Fourth Proportional to 1,439.10, 1,982.75 and 1,189.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.10 : 1,982.75 = 1,189.08 : x
2. Step 2: Convert to fraction form
   1,439.10/1,982.75 = 1,189.08/x
3. Step 3: Cross multiply
   1,439.10x = 1,982.75 × 1,189.08
4. Step 4: Simplify right side
   1,439.10x = 2,357,642.42
5. Step 5: Solve for x
   x = 2,357,642.42/1,439.10
6. Step 6: Final answer
   x = 1,638.28