Finding the Fourth Proportional to 1,904.92, 2,855.35 and 808.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,904.92 : 2,855.35 = 808.72 : x
2. Step 2: Convert to fraction form
   1,904.92/2,855.35 = 808.72/x
3. Step 3: Cross multiply
   1,904.92x = 2,855.35 × 808.72
4. Step 4: Simplify right side
   1,904.92x = 2,309,172.52
5. Step 5: Solve for x
   x = 2,309,172.52/1,904.92
6. Step 6: Final answer
   x = 1,212.22