Finding the Fourth Proportional to 1,100.81, 1,518.86 and 805.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.81 : 1,518.86 = 805.56 : x
2. Step 2: Convert to fraction form
   1,100.81/1,518.86 = 805.56/x
3. Step 3: Cross multiply
   1,100.81x = 1,518.86 × 805.56
4. Step 4: Simplify right side
   1,100.81x = 1,223,536.04
5. Step 5: Solve for x
   x = 1,223,536.04/1,100.81
6. Step 6: Final answer
   x = 1,111.49