Finding the Fourth Proportional to 1,073.16, 1,611.72 and 663.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,073.16 : 1,611.72 = 663.30 : x
2. Step 2: Convert to fraction form
   1,073.16/1,611.72 = 663.30/x
3. Step 3: Cross multiply
   1,073.16x = 1,611.72 × 663.30
4. Step 4: Simplify right side
   1,073.16x = 1,069,053.88
5. Step 5: Solve for x
   x = 1,069,053.88/1,073.16
6. Step 6: Final answer
   x = 996.17