Finding the Fourth Proportional to 1,100.73, 1,649.64 and 660.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.73 : 1,649.64 = 660.56 : x
2. Step 2: Convert to fraction form
   1,100.73/1,649.64 = 660.56/x
3. Step 3: Cross multiply
   1,100.73x = 1,649.64 × 660.56
4. Step 4: Simplify right side
   1,100.73x = 1,089,686.20
5. Step 5: Solve for x
   x = 1,089,686.20/1,100.73
6. Step 6: Final answer
   x = 989.97