Finding the Fourth Proportional to 1,909.31, 2,634.86 and 1,081.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,909.31 : 2,634.86 = 1,081.31 : x
2. Step 2: Convert to fraction form
   1,909.31/2,634.86 = 1,081.31/x
3. Step 3: Cross multiply
   1,909.31x = 2,634.86 × 1,081.31
4. Step 4: Simplify right side
   1,909.31x = 2,849,101.65
5. Step 5: Solve for x
   x = 2,849,101.65/1,909.31
6. Step 6: Final answer
   x = 1,492.21