Finding the Fourth Proportional to 1,860.72, 2,793.13 and 1,081.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,860.72 : 2,793.13 = 1,081.60 : x
2. Step 2: Convert to fraction form
   1,860.72/2,793.13 = 1,081.60/x
3. Step 3: Cross multiply
   1,860.72x = 2,793.13 × 1,081.60
4. Step 4: Simplify right side
   1,860.72x = 3,021,049.41
5. Step 5: Solve for x
   x = 3,021,049.41/1,860.72
6. Step 6: Final answer
   x = 1,623.59