Finding the Fourth Proportional to 1,715.19, 2,570.72 and 789.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,715.19 : 2,570.72 = 789.48 : x
2. Step 2: Convert to fraction form
   1,715.19/2,570.72 = 789.48/x
3. Step 3: Cross multiply
   1,715.19x = 2,570.72 × 789.48
4. Step 4: Simplify right side
   1,715.19x = 2,029,532.03
5. Step 5: Solve for x
   x = 2,029,532.03/1,715.19
6. Step 6: Final answer
   x = 1,183.27