Finding the Fourth Proportional to 1,789.69, 2,471.60 and 1,231.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,789.69 : 2,471.60 = 1,231.60 : x
2. Step 2: Convert to fraction form
   1,789.69/2,471.60 = 1,231.60/x
3. Step 3: Cross multiply
   1,789.69x = 2,471.60 × 1,231.60
4. Step 4: Simplify right side
   1,789.69x = 3,044,016.40
5. Step 5: Solve for x
   x = 3,044,016.40/1,789.69
6. Step 6: Final answer
   x = 1,700.86