Finding the Fourth Proportional to 1,320.18, 1,980.56 and 498.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,320.18 : 1,980.56 = 498.46 : x
2. Step 2: Convert to fraction form
   1,320.18/1,980.56 = 498.46/x
3. Step 3: Cross multiply
   1,320.18x = 1,980.56 × 498.46
4. Step 4: Simplify right side
   1,320.18x = 987,229.94
5. Step 5: Solve for x
   x = 987,229.94/1,320.18
6. Step 6: Final answer
   x = 747.80