Finding the Fourth Proportional to 2,109.45, 2,910.72 and 1,225.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.45 : 2,910.72 = 1,225.10 : x
2. Step 2: Convert to fraction form
   2,109.45/2,910.72 = 1,225.10/x
3. Step 3: Cross multiply
   2,109.45x = 2,910.72 × 1,225.10
4. Step 4: Simplify right side
   2,109.45x = 3,565,928.05
5. Step 5: Solve for x
   x = 3,565,928.05/2,109.45
6. Step 6: Final answer
   x = 1,690.45