Finding the Fourth Proportional to 1,559.38, 2,151.12 and 1,139.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,559.38 : 2,151.12 = 1,139.08 : x
2. Step 2: Convert to fraction form
   1,559.38/2,151.12 = 1,139.08/x
3. Step 3: Cross multiply
   1,559.38x = 2,151.12 × 1,139.08
4. Step 4: Simplify right side
   1,559.38x = 2,450,297.77
5. Step 5: Solve for x
   x = 2,450,297.77/1,559.38
6. Step 6: Final answer
   x = 1,571.33