Finding the Fourth Proportional to 1,109.62, 1,531.05 and 667.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.62 : 1,531.05 = 667.36 : x
2. Step 2: Convert to fraction form
   1,109.62/1,531.05 = 667.36/x
3. Step 3: Cross multiply
   1,109.62x = 1,531.05 × 667.36
4. Step 4: Simplify right side
   1,109.62x = 1,021,761.53
5. Step 5: Solve for x
   x = 1,021,761.53/1,109.62
6. Step 6: Final answer
   x = 920.82