Finding the Fourth Proportional to 1,073.48, 1,478.12 and 808.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,073.48 : 1,478.12 = 808.30 : x
2. Step 2: Convert to fraction form
   1,073.48/1,478.12 = 808.30/x
3. Step 3: Cross multiply
   1,073.48x = 1,478.12 × 808.30
4. Step 4: Simplify right side
   1,073.48x = 1,194,762.20
5. Step 5: Solve for x
   x = 1,194,762.20/1,073.48
6. Step 6: Final answer
   x = 1,112.99