Finding the Fourth Proportional to 1,103.98, 1,523.45 and 661.65

Step by Step Solution

1. Step 1: Write the proportion equation
   1,103.98 : 1,523.45 = 661.65 : x
2. Step 2: Convert to fraction form
   1,103.98/1,523.45 = 661.65/x
3. Step 3: Cross multiply
   1,103.98x = 1,523.45 × 661.65
4. Step 4: Simplify right side
   1,103.98x = 1,007,990.69
5. Step 5: Solve for x
   x = 1,007,990.69/1,103.98
6. Step 6: Final answer
   x = 913.05