Finding the Fourth Proportional to 1,022.08, 1,410.72 and 663.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,022.08 : 1,410.72 = 663.36 : x
2. Step 2: Convert to fraction form
   1,022.08/1,410.72 = 663.36/x
3. Step 3: Cross multiply
   1,022.08x = 1,410.72 × 663.36
4. Step 4: Simplify right side
   1,022.08x = 935,815.22
5. Step 5: Solve for x
   x = 935,815.22/1,022.08
6. Step 6: Final answer
   x = 915.60