Finding the Fourth Proportional to 3,686.70, 5,086.32 and 2,113.88

Step by Step Solution

1. Step 1: Write the proportion equation
   3,686.70 : 5,086.32 = 2,113.88 : x
2. Step 2: Convert to fraction form
   3,686.70/5,086.32 = 2,113.88/x
3. Step 3: Cross multiply
   3,686.70x = 5,086.32 × 2,113.88
4. Step 4: Simplify right side
   3,686.70x = 10,751,870.12
5. Step 5: Solve for x
   x = 10,751,870.12/3,686.70
6. Step 6: Final answer
   x = 2,916.39