Finding the Fourth Proportional to 1,109.76, 1,531.80 and 667.44

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.76 : 1,531.80 = 667.44 : x
2. Step 2: Convert to fraction form
   1,109.76/1,531.80 = 667.44/x
3. Step 3: Cross multiply
   1,109.76x = 1,531.80 × 667.44
4. Step 4: Simplify right side
   1,109.76x = 1,022,384.59
5. Step 5: Solve for x
   x = 1,022,384.59/1,109.76
6. Step 6: Final answer
   x = 921.27