Finding the Fourth Proportional to 1,105.48, 1,525.52 and 663.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.48 : 1,525.52 = 663.40 : x
2. Step 2: Convert to fraction form
   1,105.48/1,525.52 = 663.40/x
3. Step 3: Cross multiply
   1,105.48x = 1,525.52 × 663.40
4. Step 4: Simplify right side
   1,105.48x = 1,012,029.97
5. Step 5: Solve for x
   x = 1,012,029.97/1,105.48
6. Step 6: Final answer
   x = 915.47