Finding the Fourth Proportional to 1,715.48, 2,571.24 and 789.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,715.48 : 2,571.24 = 789.10 : x
2. Step 2: Convert to fraction form
   1,715.48/2,571.24 = 789.10/x
3. Step 3: Cross multiply
   1,715.48x = 2,571.24 × 789.10
4. Step 4: Simplify right side
   1,715.48x = 2,028,955.17
5. Step 5: Solve for x
   x = 2,028,955.17/1,715.48
6. Step 6: Final answer
   x = 1,182.73