Finding the Fourth Proportional to 1,789.90, 2,469.72 and 1,081.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,789.90 : 2,469.72 = 1,081.60 : x
2. Step 2: Convert to fraction form
   1,789.90/2,469.72 = 1,081.60/x
3. Step 3: Cross multiply
   1,789.90x = 2,469.72 × 1,081.60
4. Step 4: Simplify right side
   1,789.90x = 2,671,249.15
5. Step 5: Solve for x
   x = 2,671,249.15/1,789.90
6. Step 6: Final answer
   x = 1,492.40