Finding the Fourth Proportional to 2,109.40, 2,910.90 and 1,225.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.40 : 2,910.90 = 1,225.06 : x
2. Step 2: Convert to fraction form
   2,109.40/2,910.90 = 1,225.06/x
3. Step 3: Cross multiply
   2,109.40x = 2,910.90 × 1,225.06
4. Step 4: Simplify right side
   2,109.40x = 3,566,027.15
5. Step 5: Solve for x
   x = 3,566,027.15/2,109.40
6. Step 6: Final answer
   x = 1,690.54