Finding the Fourth Proportional to 2,109.23, 2,911.01 and 1,225.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.23 : 2,911.01 = 1,225.05 : x
2. Step 2: Convert to fraction form
   2,109.23/2,911.01 = 1,225.05/x
3. Step 3: Cross multiply
   2,109.23x = 2,911.01 × 1,225.05
4. Step 4: Simplify right side
   2,109.23x = 3,566,132.80
5. Step 5: Solve for x
   x = 3,566,132.80/2,109.23
6. Step 6: Final answer
   x = 1,690.73