Finding the Fourth Proportional to 1,405.60, 1,939.82 and 808.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.60 : 1,939.82 = 808.29 : x
2. Step 2: Convert to fraction form
   1,405.60/1,939.82 = 808.29/x
3. Step 3: Cross multiply
   1,405.60x = 1,939.82 × 808.29
4. Step 4: Simplify right side
   1,405.60x = 1,567,927.61
5. Step 5: Solve for x
   x = 1,567,927.61/1,405.60
6. Step 6: Final answer
   x = 1,115.48