Finding the Fourth Proportional to 3,686.07, 5,086.89 and 2,113.86

Step by Step Solution

1. Step 1: Write the proportion equation
   3,686.07 : 5,086.89 = 2,113.86 : x
2. Step 2: Convert to fraction form
   3,686.07/5,086.89 = 2,113.86/x
3. Step 3: Cross multiply
   3,686.07x = 5,086.89 × 2,113.86
4. Step 4: Simplify right side
   3,686.07x = 10,752,973.30
5. Step 5: Solve for x
   x = 10,752,973.30/3,686.07
6. Step 6: Final answer
   x = 2,917.19