Finding the Fourth Proportional to 1,109.42, 1,531.10 and 667.26

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.42 : 1,531.10 = 667.26 : x
2. Step 2: Convert to fraction form
   1,109.42/1,531.10 = 667.26/x
3. Step 3: Cross multiply
   1,109.42x = 1,531.10 × 667.26
4. Step 4: Simplify right side
   1,109.42x = 1,021,641.79
5. Step 5: Solve for x
   x = 1,021,641.79/1,109.42
6. Step 6: Final answer
   x = 920.88