Finding the Fourth Proportional to 1,189.03, 1,640.55 and 716.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,189.03 : 1,640.55 = 716.82 : x
2. Step 2: Convert to fraction form
   1,189.03/1,640.55 = 716.82/x
3. Step 3: Cross multiply
   1,189.03x = 1,640.55 × 716.82
4. Step 4: Simplify right side
   1,189.03x = 1,175,975.59
5. Step 5: Solve for x
   x = 1,175,975.59/1,189.03
6. Step 6: Final answer
   x = 989.02