Finding the Fourth Proportional to 1,405.91, 1,940.13 and 808.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.91 : 1,940.13 = 808.49 : x
2. Step 2: Convert to fraction form
   1,405.91/1,940.13 = 808.49/x
3. Step 3: Cross multiply
   1,405.91x = 1,940.13 × 808.49
4. Step 4: Simplify right side
   1,405.91x = 1,568,566.00
5. Step 5: Solve for x
   x = 1,568,566.00/1,405.91
6. Step 6: Final answer
   x = 1,115.70