Finding the Fourth Proportional to 2,109.90, 2,911.39 and 1,270.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.90 : 2,911.39 = 1,270.38 : x
2. Step 2: Convert to fraction form
   2,109.90/2,911.39 = 1,270.38/x
3. Step 3: Cross multiply
   2,109.90x = 2,911.39 × 1,270.38
4. Step 4: Simplify right side
   2,109.90x = 3,698,586.52
5. Step 5: Solve for x
   x = 3,698,586.52/2,109.90
6. Step 6: Final answer
   x = 1,752.97