Finding the Fourth Proportional to 1,391.97, 2,088.72 and 570.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.97 : 2,088.72 = 570.82 : x
2. Step 2: Convert to fraction form
   1,391.97/2,088.72 = 570.82/x
3. Step 3: Cross multiply
   1,391.97x = 2,088.72 × 570.82
4. Step 4: Simplify right side
   1,391.97x = 1,192,283.15
5. Step 5: Solve for x
   x = 1,192,283.15/1,391.97
6. Step 6: Final answer
   x = 856.54