Finding the Fourth Proportional to 1,103.89, 1,523.03 and 661.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,103.89 : 1,523.03 = 661.63 : x
2. Step 2: Convert to fraction form
   1,103.89/1,523.03 = 661.63/x
3. Step 3: Cross multiply
   1,103.89x = 1,523.03 × 661.63
4. Step 4: Simplify right side
   1,103.89x = 1,007,680.19
5. Step 5: Solve for x
   x = 1,007,680.19/1,103.89
6. Step 6: Final answer
   x = 912.85