Finding the Fourth Proportional to 2,109.69, 2,911.56 and 1,270.65

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.69 : 2,911.56 = 1,270.65 : x
2. Step 2: Convert to fraction form
   2,109.69/2,911.56 = 1,270.65/x
3. Step 3: Cross multiply
   2,109.69x = 2,911.56 × 1,270.65
4. Step 4: Simplify right side
   2,109.69x = 3,699,573.71
5. Step 5: Solve for x
   x = 3,699,573.71/2,109.69
6. Step 6: Final answer
   x = 1,753.61