Finding the Fourth Proportional to 1,103.10, 1,521.82 and 661.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,103.10 : 1,521.82 = 661.02 : x
2. Step 2: Convert to fraction form
   1,103.10/1,521.82 = 661.02/x
3. Step 3: Cross multiply
   1,103.10x = 1,521.82 × 661.02
4. Step 4: Simplify right side
   1,103.10x = 1,005,953.46
5. Step 5: Solve for x
   x = 1,005,953.46/1,103.10
6. Step 6: Final answer
   x = 911.93