Finding the Fourth Proportional to 1,105.15, 1,524.90 and 663.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.15 : 1,524.90 = 663.10 : x
2. Step 2: Convert to fraction form
   1,105.15/1,524.90 = 663.10/x
3. Step 3: Cross multiply
   1,105.15x = 1,524.90 × 663.10
4. Step 4: Simplify right side
   1,105.15x = 1,011,161.19
5. Step 5: Solve for x
   x = 1,011,161.19/1,105.15
6. Step 6: Final answer
   x = 914.95