Finding the Fourth Proportional to 1,319.82, 1,979.71 and 498.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,319.82 : 1,979.71 = 498.15 : x
2. Step 2: Convert to fraction form
   1,319.82/1,979.71 = 498.15/x
3. Step 3: Cross multiply
   1,319.82x = 1,979.71 × 498.15
4. Step 4: Simplify right side
   1,319.82x = 986,192.54
5. Step 5: Solve for x
   x = 986,192.54/1,319.82
6. Step 6: Final answer
   x = 747.22