Finding the Fourth Proportional to 1,139.34, 1,706.52 and 943.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.34 : 1,706.52 = 943.80 : x
2. Step 2: Convert to fraction form
   1,139.34/1,706.52 = 943.80/x
3. Step 3: Cross multiply
   1,139.34x = 1,706.52 × 943.80
4. Step 4: Simplify right side
   1,139.34x = 1,610,613.58
5. Step 5: Solve for x
   x = 1,610,613.58/1,139.34
6. Step 6: Final answer
   x = 1,413.64