Finding the Fourth Proportional to 3,686.20, 5,086.98 and 2,114.40

Step by Step Solution

1. Step 1: Write the proportion equation
   3,686.20 : 5,086.98 = 2,114.40 : x
2. Step 2: Convert to fraction form
   3,686.20/5,086.98 = 2,114.40/x
3. Step 3: Cross multiply
   3,686.20x = 5,086.98 × 2,114.40
4. Step 4: Simplify right side
   3,686.20x = 10,755,910.51
5. Step 5: Solve for x
   x = 10,755,910.51/3,686.20
6. Step 6: Final answer
   x = 2,917.89