Finding the Fourth Proportional to 1,290.52, 1,778.52 and 958.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,290.52 : 1,778.52 = 958.42 : x
2. Step 2: Convert to fraction form
   1,290.52/1,778.52 = 958.42/x
3. Step 3: Cross multiply
   1,290.52x = 1,778.52 × 958.42
4. Step 4: Simplify right side
   1,290.52x = 1,704,569.14
5. Step 5: Solve for x
   x = 1,704,569.14/1,290.52
6. Step 6: Final answer
   x = 1,320.84