Finding the Fourth Proportional to 1,105.60, 1,524.81 and 663.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.60 : 1,524.81 = 663.40 : x
2. Step 2: Convert to fraction form
   1,105.60/1,524.81 = 663.40/x
3. Step 3: Cross multiply
   1,105.60x = 1,524.81 × 663.40
4. Step 4: Simplify right side
   1,105.60x = 1,011,558.95
5. Step 5: Solve for x
   x = 1,011,558.95/1,105.60
6. Step 6: Final answer
   x = 914.94