Finding the Fourth Proportional to 2,086.76, 2,877.54 and 1,386.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.76 : 2,877.54 = 1,386.92 : x
2. Step 2: Convert to fraction form
   2,086.76/2,877.54 = 1,386.92/x
3. Step 3: Cross multiply
   2,086.76x = 2,877.54 × 1,386.92
4. Step 4: Simplify right side
   2,086.76x = 3,990,917.78
5. Step 5: Solve for x
   x = 3,990,917.78/2,086.76
6. Step 6: Final answer
   x = 1,912.49