Finding the Fourth Proportional to 1,406.08, 1,940.35 and 808.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,406.08 : 1,940.35 = 808.57 : x
2. Step 2: Convert to fraction form
   1,406.08/1,940.35 = 808.57/x
3. Step 3: Cross multiply
   1,406.08x = 1,940.35 × 808.57
4. Step 4: Simplify right side
   1,406.08x = 1,568,908.80
5. Step 5: Solve for x
   x = 1,568,908.80/1,406.08
6. Step 6: Final answer
   x = 1,115.80