Finding the Fourth Proportional to 1,109.84, 1,531.32 and 667.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.84 : 1,531.32 = 667.76 : x
2. Step 2: Convert to fraction form
   1,109.84/1,531.32 = 667.76/x
3. Step 3: Cross multiply
   1,109.84x = 1,531.32 × 667.76
4. Step 4: Simplify right side
   1,109.84x = 1,022,554.24
5. Step 5: Solve for x
   x = 1,022,554.24/1,109.84
6. Step 6: Final answer
   x = 921.35