Finding the Fourth Proportional to 1,559.07, 2,150.78 and 961.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,559.07 : 2,150.78 = 961.29 : x
2. Step 2: Convert to fraction form
   1,559.07/2,150.78 = 961.29/x
3. Step 3: Cross multiply
   1,559.07x = 2,150.78 × 961.29
4. Step 4: Simplify right side
   1,559.07x = 2,067,518.50
5. Step 5: Solve for x
   x = 2,067,518.50/1,559.07
6. Step 6: Final answer
   x = 1,326.12