Finding the Fourth Proportional to 1,620.63, 2,429.57 and 797.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,620.63 : 2,429.57 = 797.78 : x
2. Step 2: Convert to fraction form
   1,620.63/2,429.57 = 797.78/x
3. Step 3: Cross multiply
   1,620.63x = 2,429.57 × 797.78
4. Step 4: Simplify right side
   1,620.63x = 1,938,270.42
5. Step 5: Solve for x
   x = 1,938,270.42/1,620.63
6. Step 6: Final answer
   x = 1,196.00