Finding the Fourth Proportional to 680.00, 1,020.59 and 355.59

Step by Step Solution

1. Step 1: Write the proportion equation
   680.00 : 1,020.59 = 355.59 : x
2. Step 2: Convert to fraction form
   680.00/1,020.59 = 355.59/x
3. Step 3: Cross multiply
   680.00x = 1,020.59 × 355.59
4. Step 4: Simplify right side
   680.00x = 362,909.82
5. Step 5: Solve for x
   x = 362,909.82/680.00
6. Step 6: Final answer
   x = 533.69