Finding the Fourth Proportional to 1,489.89, 2,055.32 and 992.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,489.89 : 2,055.32 = 992.58 : x
2. Step 2: Convert to fraction form
   1,489.89/2,055.32 = 992.58/x
3. Step 3: Cross multiply
   1,489.89x = 2,055.32 × 992.58
4. Step 4: Simplify right side
   1,489.89x = 2,040,071.94
5. Step 5: Solve for x
   x = 2,040,071.94/1,489.89
6. Step 6: Final answer
   x = 1,369.27