Finding the Fourth Proportional to 1,320.48, 1,979.37 and 498.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,320.48 : 1,979.37 = 498.42 : x
2. Step 2: Convert to fraction form
   1,320.48/1,979.37 = 498.42/x
3. Step 3: Cross multiply
   1,320.48x = 1,979.37 × 498.42
4. Step 4: Simplify right side
   1,320.48x = 986,557.60
5. Step 5: Solve for x
   x = 986,557.60/1,320.48
6. Step 6: Final answer
   x = 747.12