Finding the Fourth Proportional to 1,128.84, 1,557.54 and 663.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.84 : 1,557.54 = 663.24 : x
2. Step 2: Convert to fraction form
   1,128.84/1,557.54 = 663.24/x
3. Step 3: Cross multiply
   1,128.84x = 1,557.54 × 663.24
4. Step 4: Simplify right side
   1,128.84x = 1,033,022.83
5. Step 5: Solve for x
   x = 1,033,022.83/1,128.84
6. Step 6: Final answer
   x = 915.12