Finding the Fourth Proportional to 1,405.56, 1,939.49 and 808.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.56 : 1,939.49 = 808.09 : x
2. Step 2: Convert to fraction form
   1,405.56/1,939.49 = 808.09/x
3. Step 3: Cross multiply
   1,405.56x = 1,939.49 × 808.09
4. Step 4: Simplify right side
   1,405.56x = 1,567,273.58
5. Step 5: Solve for x
   x = 1,567,273.58/1,405.56
6. Step 6: Final answer
   x = 1,115.05