Finding the Fourth Proportional to 1,105.69, 1,525.79 and 663.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.69 : 1,525.79 = 663.84 : x
2. Step 2: Convert to fraction form
   1,105.69/1,525.79 = 663.84/x
3. Step 3: Cross multiply
   1,105.69x = 1,525.79 × 663.84
4. Step 4: Simplify right side
   1,105.69x = 1,012,874.07
5. Step 5: Solve for x
   x = 1,012,874.07/1,105.69
6. Step 6: Final answer
   x = 916.05