Finding the Fourth Proportional to 1,185.94, 1,636.89 and 720.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185.94 : 1,636.89 = 720.58 : x
2. Step 2: Convert to fraction form
   1,185.94/1,636.89 = 720.58/x
3. Step 3: Cross multiply
   1,185.94x = 1,636.89 × 720.58
4. Step 4: Simplify right side
   1,185.94x = 1,179,510.20
5. Step 5: Solve for x
   x = 1,179,510.20/1,185.94
6. Step 6: Final answer
   x = 994.58