Finding the Fourth Proportional to 3,685.23, 5,085.65 and 2,113.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,685.23 : 5,085.65 = 2,113.31 : x
2. Step 2: Convert to fraction form
   3,685.23/5,085.65 = 2,113.31/x
3. Step 3: Cross multiply
   3,685.23x = 5,085.65 × 2,113.31
4. Step 4: Simplify right side
   3,685.23x = 10,747,573.00
5. Step 5: Solve for x
   x = 10,747,573.00/3,685.23
6. Step 6: Final answer
   x = 2,916.39