Finding the Fourth Proportional to 2,109.34, 2,910.42 and 1,225.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.34 : 2,910.42 = 1,225.12 : x
2. Step 2: Convert to fraction form
   2,109.34/2,910.42 = 1,225.12/x
3. Step 3: Cross multiply
   2,109.34x = 2,910.42 × 1,225.12
4. Step 4: Simplify right side
   2,109.34x = 3,565,613.75
5. Step 5: Solve for x
   x = 3,565,613.75/2,109.34
6. Step 6: Final answer
   x = 1,690.39