Finding the Fourth Proportional to 1,320.22, 1,980.77 and 498.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,320.22 : 1,980.77 = 498.56 : x
2. Step 2: Convert to fraction form
   1,320.22/1,980.77 = 498.56/x
3. Step 3: Cross multiply
   1,320.22x = 1,980.77 × 498.56
4. Step 4: Simplify right side
   1,320.22x = 987,535.15
5. Step 5: Solve for x
   x = 987,535.15/1,320.22
6. Step 6: Final answer
   x = 748.01