Finding the Fourth Proportional to 1,390.94, 2,085.72 and 952.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,390.94 : 2,085.72 = 952.86 : x
2. Step 2: Convert to fraction form
   1,390.94/2,085.72 = 952.86/x
3. Step 3: Cross multiply
   1,390.94x = 2,085.72 × 952.86
4. Step 4: Simplify right side
   1,390.94x = 1,987,399.16
5. Step 5: Solve for x
   x = 1,987,399.16/1,390.94
6. Step 6: Final answer
   x = 1,428.82