Finding the Fourth Proportional to 1,109.55, 1,531.20 and 667.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.55 : 1,531.20 = 667.37 : x
2. Step 2: Convert to fraction form
   1,109.55/1,531.20 = 667.37/x
3. Step 3: Cross multiply
   1,109.55x = 1,531.20 × 667.37
4. Step 4: Simplify right side
   1,109.55x = 1,021,869.29
5. Step 5: Solve for x
   x = 1,021,869.29/1,109.55
6. Step 6: Final answer
   x = 920.98