Finding the Fourth Proportional to 498.69, 744.50 and 430.17

Step by Step Solution

1. Step 1: Write the proportion equation
   498.69 : 744.50 = 430.17 : x
2. Step 2: Convert to fraction form
   498.69/744.50 = 430.17/x
3. Step 3: Cross multiply
   498.69x = 744.50 × 430.17
4. Step 4: Simplify right side
   498.69x = 320,261.57
5. Step 5: Solve for x
   x = 320,261.57/498.69
6. Step 6: Final answer
   x = 642.21