Finding the Fourth Proportional to 1,620.63, 2,429.79 and 798.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,620.63 : 2,429.79 = 798.72 : x
2. Step 2: Convert to fraction form
   1,620.63/2,429.79 = 798.72/x
3. Step 3: Cross multiply
   1,620.63x = 2,429.79 × 798.72
4. Step 4: Simplify right side
   1,620.63x = 1,940,721.87
5. Step 5: Solve for x
   x = 1,940,721.87/1,620.63
6. Step 6: Final answer
   x = 1,197.51