Finding the Fourth Proportional to 1,987.86, 2,983.59 and 1,660.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,987.86 : 2,983.59 = 1,660.83 : x
2. Step 2: Convert to fraction form
   1,987.86/2,983.59 = 1,660.83/x
3. Step 3: Cross multiply
   1,987.86x = 2,983.59 × 1,660.83
4. Step 4: Simplify right side
   1,987.86x = 4,955,235.78
5. Step 5: Solve for x
   x = 4,955,235.78/1,987.86
6. Step 6: Final answer
   x = 2,492.75