Finding the Fourth Proportional to 1,320.49, 1,980.83 and 498.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,320.49 : 1,980.83 = 498.61 : x
2. Step 2: Convert to fraction form
   1,320.49/1,980.83 = 498.61/x
3. Step 3: Cross multiply
   1,320.49x = 1,980.83 × 498.61
4. Step 4: Simplify right side
   1,320.49x = 987,661.65
5. Step 5: Solve for x
   x = 987,661.65/1,320.49
6. Step 6: Final answer
   x = 747.95