Finding the Fourth Proportional to 1,160.74, 1,601.60 and 663.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,160.74 : 1,601.60 = 663.53 : x
2. Step 2: Convert to fraction form
   1,160.74/1,601.60 = 663.53/x
3. Step 3: Cross multiply
   1,160.74x = 1,601.60 × 663.53
4. Step 4: Simplify right side
   1,160.74x = 1,062,710.33
5. Step 5: Solve for x
   x = 1,062,710.33/1,160.74
6. Step 6: Final answer
   x = 915.55