Finding the Fourth Proportional to 1,320.39, 1,981.49 and 498.65

Step by Step Solution

1. Step 1: Write the proportion equation
   1,320.39 : 1,981.49 = 498.65 : x
2. Step 2: Convert to fraction form
   1,320.39/1,981.49 = 498.65/x
3. Step 3: Cross multiply
   1,320.39x = 1,981.49 × 498.65
4. Step 4: Simplify right side
   1,320.39x = 988,057.59
5. Step 5: Solve for x
   x = 988,057.59/1,320.39
6. Step 6: Final answer
   x = 748.31