Finding the Fourth Proportional to 1,109.47, 1,665.37 and 817.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.47 : 1,665.37 = 817.30 : x
2. Step 2: Convert to fraction form
   1,109.47/1,665.37 = 817.30/x
3. Step 3: Cross multiply
   1,109.47x = 1,665.37 × 817.30
4. Step 4: Simplify right side
   1,109.47x = 1,361,106.90
5. Step 5: Solve for x
   x = 1,361,106.90/1,109.47
6. Step 6: Final answer
   x = 1,226.81