Finding the Fourth Proportional to 1,438.42, 1,984.84 and 808.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,438.42 : 1,984.84 = 808.81 : x
2. Step 2: Convert to fraction form
   1,438.42/1,984.84 = 808.81/x
3. Step 3: Cross multiply
   1,438.42x = 1,984.84 × 808.81
4. Step 4: Simplify right side
   1,438.42x = 1,605,358.44
5. Step 5: Solve for x
   x = 1,605,358.44/1,438.42
6. Step 6: Final answer
   x = 1,116.06