Finding the Fourth Proportional to 2,109.41, 2,911.23 and 1,225.02

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.41 : 2,911.23 = 1,225.02 : x
2. Step 2: Convert to fraction form
   2,109.41/2,911.23 = 1,225.02/x
3. Step 3: Cross multiply
   2,109.41x = 2,911.23 × 1,225.02
4. Step 4: Simplify right side
   2,109.41x = 3,566,314.97
5. Step 5: Solve for x
   x = 3,566,314.97/2,109.41
6. Step 6: Final answer
   x = 1,690.67