Finding the Fourth Proportional to 3,436.74, 5,155.48 and 1,128.42

Step by Step Solution

1. Step 1: Write the proportion equation
   3,436.74 : 5,155.48 = 1,128.42 : x
2. Step 2: Convert to fraction form
   3,436.74/5,155.48 = 1,128.42/x
3. Step 3: Cross multiply
   3,436.74x = 5,155.48 × 1,128.42
4. Step 4: Simplify right side
   3,436.74x = 5,817,546.74
5. Step 5: Solve for x
   x = 5,817,546.74/3,436.74
6. Step 6: Final answer
   x = 1,692.75