Finding the Fourth Proportional to 498.82, 689.19 and 436.72

Step by Step Solution

1. Step 1: Write the proportion equation
   498.82 : 689.19 = 436.72 : x
2. Step 2: Convert to fraction form
   498.82/689.19 = 436.72/x
3. Step 3: Cross multiply
   498.82x = 689.19 × 436.72
4. Step 4: Simplify right side
   498.82x = 300,983.06
5. Step 5: Solve for x
   x = 300,983.06/498.82
6. Step 6: Final answer
   x = 603.39