Finding the Fourth Proportional to 1,109.74, 1,531.71 and 667.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.74 : 1,531.71 = 667.56 : x
2. Step 2: Convert to fraction form
   1,109.74/1,531.71 = 667.56/x
3. Step 3: Cross multiply
   1,109.74x = 1,531.71 × 667.56
4. Step 4: Simplify right side
   1,109.74x = 1,022,497.33
5. Step 5: Solve for x
   x = 1,022,497.33/1,109.74
6. Step 6: Final answer
   x = 921.38