Finding the Fourth Proportional to 1,103.76, 1,522.80 and 661.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,103.76 : 1,522.80 = 661.32 : x
2. Step 2: Convert to fraction form
   1,103.76/1,522.80 = 661.32/x
3. Step 3: Cross multiply
   1,103.76x = 1,522.80 × 661.32
4. Step 4: Simplify right side
   1,103.76x = 1,007,058.10
5. Step 5: Solve for x
   x = 1,007,058.10/1,103.76
6. Step 6: Final answer
   x = 912.39