Finding the Fourth Proportional to 1,057.25, 1,458.38 and 663.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,057.25 : 1,458.38 = 663.59 : x
2. Step 2: Convert to fraction form
   1,057.25/1,458.38 = 663.59/x
3. Step 3: Cross multiply
   1,057.25x = 1,458.38 × 663.59
4. Step 4: Simplify right side
   1,057.25x = 967,755.77
5. Step 5: Solve for x
   x = 967,755.77/1,057.25
6. Step 6: Final answer
   x = 915.36