Finding the Fourth Proportional to 2,109.70, 2,910.94 and 1,225.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.70 : 2,910.94 = 1,225.04 : x
2. Step 2: Convert to fraction form
   2,109.70/2,910.94 = 1,225.04/x
3. Step 3: Cross multiply
   2,109.70x = 2,910.94 × 1,225.04
4. Step 4: Simplify right side
   2,109.70x = 3,566,022.15
5. Step 5: Solve for x
   x = 3,566,022.15/2,109.70
6. Step 6: Final answer
   x = 1,690.30