Finding the Fourth Proportional to 1,104.58, 1,643.45 and 1,100.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,104.58 : 1,643.45 = 1,100.80 : x
2. Step 2: Convert to fraction form
   1,104.58/1,643.45 = 1,100.80/x
3. Step 3: Cross multiply
   1,104.58x = 1,643.45 × 1,100.80
4. Step 4: Simplify right side
   1,104.58x = 1,809,109.76
5. Step 5: Solve for x
   x = 1,809,109.76/1,104.58
6. Step 6: Final answer
   x = 1,637.83