Finding the Fourth Proportional to 1,109.92, 1,531.79 and 667.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.92 : 1,531.79 = 667.75 : x
2. Step 2: Convert to fraction form
   1,109.92/1,531.79 = 667.75/x
3. Step 3: Cross multiply
   1,109.92x = 1,531.79 × 667.75
4. Step 4: Simplify right side
   1,109.92x = 1,022,852.77
5. Step 5: Solve for x
   x = 1,022,852.77/1,109.92
6. Step 6: Final answer
   x = 921.56