Finding the Fourth Proportional to 3,685.40, 5,086.00 and 2,113.79

Step by Step Solution

1. Step 1: Write the proportion equation
   3,685.40 : 5,086.00 = 2,113.79 : x
2. Step 2: Convert to fraction form
   3,685.40/5,086.00 = 2,113.79/x
3. Step 3: Cross multiply
   3,685.40x = 5,086.00 × 2,113.79
4. Step 4: Simplify right side
   3,685.40x = 10,750,725.37
5. Step 5: Solve for x
   x = 10,750,725.37/3,685.40
6. Step 6: Final answer
   x = 2,917.12