Finding the Fourth Proportional to 2,109.24, 2,910.60 and 1,213.08

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.24 : 2,910.60 = 1,213.08 : x
2. Step 2: Convert to fraction form
   2,109.24/2,910.60 = 1,213.08/x
3. Step 3: Cross multiply
   2,109.24x = 2,910.60 × 1,213.08
4. Step 4: Simplify right side
   2,109.24x = 3,530,790.65
5. Step 5: Solve for x
   x = 3,530,790.65/2,109.24
6. Step 6: Final answer
   x = 1,673.96