Finding the Fourth Proportional to 1,903.42, 2,856.57 and 808.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,903.42 : 2,856.57 = 808.55 : x
2. Step 2: Convert to fraction form
   1,903.42/2,856.57 = 808.55/x
3. Step 3: Cross multiply
   1,903.42x = 2,856.57 × 808.55
4. Step 4: Simplify right side
   1,903.42x = 2,309,689.85
5. Step 5: Solve for x
   x = 2,309,689.85/1,903.42
6. Step 6: Final answer
   x = 1,213.44