Finding the Fourth Proportional to 1,103.61, 1,522.92 and 661.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,103.61 : 1,522.92 = 661.29 : x
2. Step 2: Convert to fraction form
   1,103.61/1,522.92 = 661.29/x
3. Step 3: Cross multiply
   1,103.61x = 1,522.92 × 661.29
4. Step 4: Simplify right side
   1,103.61x = 1,007,091.77
5. Step 5: Solve for x
   x = 1,007,091.77/1,103.61
6. Step 6: Final answer
   x = 912.54