Finding the Fourth Proportional to 1,715.71, 2,570.12 and 789.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,715.71 : 2,570.12 = 789.98 : x
2. Step 2: Convert to fraction form
   1,715.71/2,570.12 = 789.98/x
3. Step 3: Cross multiply
   1,715.71x = 2,570.12 × 789.98
4. Step 4: Simplify right side
   1,715.71x = 2,030,343.40
5. Step 5: Solve for x
   x = 2,030,343.40/1,715.71
6. Step 6: Final answer
   x = 1,183.38