Finding the Fourth Proportional to 2,160.86, 2,982.06 and 1,276.65

Step by Step Solution

1. Step 1: Write the proportion equation
   2,160.86 : 2,982.06 = 1,276.65 : x
2. Step 2: Convert to fraction form
   2,160.86/2,982.06 = 1,276.65/x
3. Step 3: Cross multiply
   2,160.86x = 2,982.06 × 1,276.65
4. Step 4: Simplify right side
   2,160.86x = 3,807,046.90
5. Step 5: Solve for x
   x = 3,807,046.90/2,160.86
6. Step 6: Final answer
   x = 1,761.82