Finding the Fourth Proportional to 1,160.72, 1,601.88 and 663.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,160.72 : 1,601.88 = 663.38 : x
2. Step 2: Convert to fraction form
   1,160.72/1,601.88 = 663.38/x
3. Step 3: Cross multiply
   1,160.72x = 1,601.88 × 663.38
4. Step 4: Simplify right side
   1,160.72x = 1,062,653.15
5. Step 5: Solve for x
   x = 1,062,653.15/1,160.72
6. Step 6: Final answer
   x = 915.51