Finding the Fourth Proportional to 1,167.82, 1,611.31 and 663.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,167.82 : 1,611.31 = 663.56 : x
2. Step 2: Convert to fraction form
   1,167.82/1,611.31 = 663.56/x
3. Step 3: Cross multiply
   1,167.82x = 1,611.31 × 663.56
4. Step 4: Simplify right side
   1,167.82x = 1,069,203.23
5. Step 5: Solve for x
   x = 1,069,203.23/1,167.82
6. Step 6: Final answer
   x = 915.55