Finding the Fourth Proportional to 1,103.70, 1,522.72 and 661.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,103.70 : 1,522.72 = 661.74 : x
2. Step 2: Convert to fraction form
   1,103.70/1,522.72 = 661.74/x
3. Step 3: Cross multiply
   1,103.70x = 1,522.72 × 661.74
4. Step 4: Simplify right side
   1,103.70x = 1,007,644.73
5. Step 5: Solve for x
   x = 1,007,644.73/1,103.70
6. Step 6: Final answer
   x = 912.97