Finding the Fourth Proportional to 1,100.39, 1,649.30 and 809.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.39 : 1,649.30 = 809.12 : x
2. Step 2: Convert to fraction form
   1,100.39/1,649.30 = 809.12/x
3. Step 3: Cross multiply
   1,100.39x = 1,649.30 × 809.12
4. Step 4: Simplify right side
   1,100.39x = 1,334,481.69
5. Step 5: Solve for x
   x = 1,334,481.69/1,100.39
6. Step 6: Final answer
   x = 1,212.74