Finding the Fourth Proportional to 1,109.49, 1,531.06 and 667.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.49 : 1,531.06 = 667.23 : x
2. Step 2: Convert to fraction form
   1,109.49/1,531.06 = 667.23/x
3. Step 3: Cross multiply
   1,109.49x = 1,531.06 × 667.23
4. Step 4: Simplify right side
   1,109.49x = 1,021,569.16
5. Step 5: Solve for x
   x = 1,021,569.16/1,109.49
6. Step 6: Final answer
   x = 920.76