Finding the Fourth Proportional to 1,185.89, 1,635.55 and 890.65

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185.89 : 1,635.55 = 890.65 : x
2. Step 2: Convert to fraction form
   1,185.89/1,635.55 = 890.65/x
3. Step 3: Cross multiply
   1,185.89x = 1,635.55 × 890.65
4. Step 4: Simplify right side
   1,185.89x = 1,456,696.29
5. Step 5: Solve for x
   x = 1,456,696.29/1,185.89
6. Step 6: Final answer
   x = 1,228.35