Finding the Fourth Proportional to 3,128.56, 4,692.78 and 1,279.24

Step by Step Solution

1. Step 1: Write the proportion equation
   3,128.56 : 4,692.78 = 1,279.24 : x
2. Step 2: Convert to fraction form
   3,128.56/4,692.78 = 1,279.24/x
3. Step 3: Cross multiply
   3,128.56x = 4,692.78 × 1,279.24
4. Step 4: Simplify right side
   3,128.56x = 6,003,191.89
5. Step 5: Solve for x
   x = 6,003,191.89/3,128.56
6. Step 6: Final answer
   x = 1,918.84