Finding the Fourth Proportional to 1,101.88, 1,520.56 and 660.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,101.88 : 1,520.56 = 660.09 : x
2. Step 2: Convert to fraction form
   1,101.88/1,520.56 = 660.09/x
3. Step 3: Cross multiply
   1,101.88x = 1,520.56 × 660.09
4. Step 4: Simplify right side
   1,101.88x = 1,003,706.45
5. Step 5: Solve for x
   x = 1,003,706.45/1,101.88
6. Step 6: Final answer
   x = 910.90