Finding the Fourth Proportional to 2,109.61, 2,911.25 and 1,225.93

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.61 : 2,911.25 = 1,225.93 : x
2. Step 2: Convert to fraction form
   2,109.61/2,911.25 = 1,225.93/x
3. Step 3: Cross multiply
   2,109.61x = 2,911.25 × 1,225.93
4. Step 4: Simplify right side
   2,109.61x = 3,568,988.71
5. Step 5: Solve for x
   x = 3,568,988.71/2,109.61
6. Step 6: Final answer
   x = 1,691.78