Finding the Fourth Proportional to 1,903.50, 2,856.42 and 808.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,903.50 : 2,856.42 = 808.38 : x
2. Step 2: Convert to fraction form
   1,903.50/2,856.42 = 808.38/x
3. Step 3: Cross multiply
   1,903.50x = 2,856.42 × 808.38
4. Step 4: Simplify right side
   1,903.50x = 2,309,072.80
5. Step 5: Solve for x
   x = 2,309,072.80/1,903.50
6. Step 6: Final answer
   x = 1,213.07