Finding the Fourth Proportional to 1,320.68, 1,980.82 and 498.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,320.68 : 1,980.82 = 498.53 : x
2. Step 2: Convert to fraction form
   1,320.68/1,980.82 = 498.53/x
3. Step 3: Cross multiply
   1,320.68x = 1,980.82 × 498.53
4. Step 4: Simplify right side
   1,320.68x = 987,498.19
5. Step 5: Solve for x
   x = 987,498.19/1,320.68
6. Step 6: Final answer
   x = 747.72