Finding the Fourth Proportional to 1,160.69, 1,601.71 and 663.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,160.69 : 1,601.71 = 663.21 : x
2. Step 2: Convert to fraction form
   1,160.69/1,601.71 = 663.21/x
3. Step 3: Cross multiply
   1,160.69x = 1,601.71 × 663.21
4. Step 4: Simplify right side
   1,160.69x = 1,062,268.43
5. Step 5: Solve for x
   x = 1,062,268.43/1,160.69
6. Step 6: Final answer
   x = 915.21