Finding the Fourth Proportional to 1,438.16, 1,984.50 and 808.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,438.16 : 1,984.50 = 808.76 : x
2. Step 2: Convert to fraction form
   1,438.16/1,984.50 = 808.76/x
3. Step 3: Cross multiply
   1,438.16x = 1,984.50 × 808.76
4. Step 4: Simplify right side
   1,438.16x = 1,604,983.60
5. Step 5: Solve for x
   x = 1,604,983.60/1,438.16
6. Step 6: Final answer
   x = 1,116.00