Finding the Fourth Proportional to 1,139.25, 1,707.72 and 943.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.25 : 1,707.72 = 943.09 : x
2. Step 2: Convert to fraction form
   1,139.25/1,707.72 = 943.09/x
3. Step 3: Cross multiply
   1,139.25x = 1,707.72 × 943.09
4. Step 4: Simplify right side
   1,139.25x = 1,610,533.65
5. Step 5: Solve for x
   x = 1,610,533.65/1,139.25
6. Step 6: Final answer
   x = 1,413.68