Finding the Fourth Proportional to 1,320.94, 1,980.33 and 498.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,320.94 : 1,980.33 = 498.75 : x
2. Step 2: Convert to fraction form
   1,320.94/1,980.33 = 498.75/x
3. Step 3: Cross multiply
   1,320.94x = 1,980.33 × 498.75
4. Step 4: Simplify right side
   1,320.94x = 987,689.59
5. Step 5: Solve for x
   x = 987,689.59/1,320.94
6. Step 6: Final answer
   x = 747.72