Finding the Fourth Proportional to 1,103.83, 1,523.21 and 661.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,103.83 : 1,523.21 = 661.70 : x
2. Step 2: Convert to fraction form
   1,103.83/1,523.21 = 661.70/x
3. Step 3: Cross multiply
   1,103.83x = 1,523.21 × 661.70
4. Step 4: Simplify right side
   1,103.83x = 1,007,908.56
5. Step 5: Solve for x
   x = 1,007,908.56/1,103.83
6. Step 6: Final answer
   x = 913.10