Finding the Fourth Proportional to 3,856.15, 5,753.93 and 3,621.05

Step by Step Solution

1. Step 1: Write the proportion equation
   3,856.15 : 5,753.93 = 3,621.05 : x
2. Step 2: Convert to fraction form
   3,856.15/5,753.93 = 3,621.05/x
3. Step 3: Cross multiply
   3,856.15x = 5,753.93 × 3,621.05
4. Step 4: Simplify right side
   3,856.15x = 20,835,268.23
5. Step 5: Solve for x
   x = 20,835,268.23/3,856.15
6. Step 6: Final answer
   x = 5,403.13