Finding the Fourth Proportional to 1,078.21, 1,488.00 and 658.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.21 : 1,488.00 = 658.45 : x
2. Step 2: Convert to fraction form
   1,078.21/1,488.00 = 658.45/x
3. Step 3: Cross multiply
   1,078.21x = 1,488.00 × 658.45
4. Step 4: Simplify right side
   1,078.21x = 979,776.56
5. Step 5: Solve for x
   x = 979,776.56/1,078.21
6. Step 6: Final answer
   x = 908.71