Finding the Fourth Proportional to 1,109.94, 1,531.73 and 667.85

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.94 : 1,531.73 = 667.85 : x
2. Step 2: Convert to fraction form
   1,109.94/1,531.73 = 667.85/x
3. Step 3: Cross multiply
   1,109.94x = 1,531.73 × 667.85
4. Step 4: Simplify right side
   1,109.94x = 1,022,965.88
5. Step 5: Solve for x
   x = 1,022,965.88/1,109.94
6. Step 6: Final answer
   x = 921.64