Finding the Fourth Proportional to 3,412.94, 5,109.62 and 2,105.60

Step by Step Solution

1. Step 1: Write the proportion equation
   3,412.94 : 5,109.62 = 2,105.60 : x
2. Step 2: Convert to fraction form
   3,412.94/5,109.62 = 2,105.60/x
3. Step 3: Cross multiply
   3,412.94x = 5,109.62 × 2,105.60
4. Step 4: Simplify right side
   3,412.94x = 10,758,779.80
5. Step 5: Solve for x
   x = 10,758,779.80/3,412.94
6. Step 6: Final answer
   x = 3,152.35