Finding the Fourth Proportional to 2,109.59, 2,911.06 and 1,225.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.59 : 2,911.06 = 1,225.45 : x
2. Step 2: Convert to fraction form
   2,109.59/2,911.06 = 1,225.45/x
3. Step 3: Cross multiply
   2,109.59x = 2,911.06 × 1,225.45
4. Step 4: Simplify right side
   2,109.59x = 3,567,358.48
5. Step 5: Solve for x
   x = 3,567,358.48/2,109.59
6. Step 6: Final answer
   x = 1,691.02