Finding the Fourth Proportional to 1,320.69, 1,979.96 and 498.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,320.69 : 1,979.96 = 498.50 : x
2. Step 2: Convert to fraction form
   1,320.69/1,979.96 = 498.50/x
3. Step 3: Cross multiply
   1,320.69x = 1,979.96 × 498.50
4. Step 4: Simplify right side
   1,320.69x = 986,997.67
5. Step 5: Solve for x
   x = 986,997.67/1,320.69
6. Step 6: Final answer
   x = 747.33