Finding the Fourth Proportional to 3,685.50, 5,086.01 and 2,113.61

Step by Step Solution

1. Step 1: Write the proportion equation
   3,685.50 : 5,086.01 = 2,113.61 : x
2. Step 2: Convert to fraction form
   3,685.50/5,086.01 = 2,113.61/x
3. Step 3: Cross multiply
   3,685.50x = 5,086.01 × 2,113.61
4. Step 4: Simplify right side
   3,685.50x = 10,749,821.45
5. Step 5: Solve for x
   x = 10,749,821.45/3,685.50
6. Step 6: Final answer
   x = 2,916.79