Finding the Fourth Proportional to 1,105.62, 1,525.55 and 663.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.62 : 1,525.55 = 663.36 : x
2. Step 2: Convert to fraction form
   1,105.62/1,525.55 = 663.36/x
3. Step 3: Cross multiply
   1,105.62x = 1,525.55 × 663.36
4. Step 4: Simplify right side
   1,105.62x = 1,011,985.53
5. Step 5: Solve for x
   x = 1,011,985.53/1,105.62
6. Step 6: Final answer
   x = 915.31