Finding the Fourth Proportional to 1,105.69, 1,525.84 and 663.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.69 : 1,525.84 = 663.59 : x
2. Step 2: Convert to fraction form
   1,105.69/1,525.84 = 663.59/x
3. Step 3: Cross multiply
   1,105.69x = 1,525.84 × 663.59
4. Step 4: Simplify right side
   1,105.69x = 1,012,532.17
5. Step 5: Solve for x
   x = 1,012,532.17/1,105.69
6. Step 6: Final answer
   x = 915.75