Finding the Fourth Proportional to 3,783.60, 5,221.32 and 2,105

Step by Step Solution

1. Step 1: Write the proportion equation
   3,783.60 : 5,221.32 = 2,105 : x
2. Step 2: Convert to fraction form
   3,783.60/5,221.32 = 2,105/x
3. Step 3: Cross multiply
   3,783.60x = 5,221.32 × 2,105
4. Step 4: Simplify right side
   3,783.60x = 10,990,878.60
5. Step 5: Solve for x
   x = 10,990,878.60/3,783.60
6. Step 6: Final answer
   x = 2,904.87