Finding the Fourth Proportional to 1,320.79, 1,979.43 and 498.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,320.79 : 1,979.43 = 498.10 : x
2. Step 2: Convert to fraction form
   1,320.79/1,979.43 = 498.10/x
3. Step 3: Cross multiply
   1,320.79x = 1,979.43 × 498.10
4. Step 4: Simplify right side
   1,320.79x = 985,954.08
5. Step 5: Solve for x
   x = 985,954.08/1,320.79
6. Step 6: Final answer
   x = 746.49