Finding the Fourth Proportional to 3,685.15, 5,085.98 and 2,113.21

Step by Step Solution

1. Step 1: Write the proportion equation
   3,685.15 : 5,085.98 = 2,113.21 : x
2. Step 2: Convert to fraction form
   3,685.15/5,085.98 = 2,113.21/x
3. Step 3: Cross multiply
   3,685.15x = 5,085.98 × 2,113.21
4. Step 4: Simplify right side
   3,685.15x = 10,747,743.80
5. Step 5: Solve for x
   x = 10,747,743.80/3,685.15
6. Step 6: Final answer
   x = 2,916.50