Finding the Fourth Proportional to 2,109.40, 2,910.33 and 1,225.03

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.40 : 2,910.33 = 1,225.03 : x
2. Step 2: Convert to fraction form
   2,109.40/2,910.33 = 1,225.03/x
3. Step 3: Cross multiply
   2,109.40x = 2,910.33 × 1,225.03
4. Step 4: Simplify right side
   2,109.40x = 3,565,247.93
5. Step 5: Solve for x
   x = 3,565,247.93/2,109.40
6. Step 6: Final answer
   x = 1,690.17