Finding the Fourth Proportional to 1,620.14, 2,429.60 and 798.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,620.14 : 2,429.60 = 798.80 : x
2. Step 2: Convert to fraction form
   1,620.14/2,429.60 = 798.80/x
3. Step 3: Cross multiply
   1,620.14x = 2,429.60 × 798.80
4. Step 4: Simplify right side
   1,620.14x = 1,940,748.34
5. Step 5: Solve for x
   x = 1,940,748.34/1,620.14
6. Step 6: Final answer
   x = 1,197.89