Finding the Fourth Proportional to 1,828.91, 2,523.89 and 989.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,828.91 : 2,523.89 = 989.61 : x
2. Step 2: Convert to fraction form
   1,828.91/2,523.89 = 989.61/x
3. Step 3: Cross multiply
   1,828.91x = 2,523.89 × 989.61
4. Step 4: Simplify right side
   1,828.91x = 2,497,659.79
5. Step 5: Solve for x
   x = 2,497,659.79/1,828.91
6. Step 6: Final answer
   x = 1,365.65