Finding the Fourth Proportional to 3,469.01, 5,202.20 and 1,128.40

Step by Step Solution

1. Step 1: Write the proportion equation
   3,469.01 : 5,202.20 = 1,128.40 : x
2. Step 2: Convert to fraction form
   3,469.01/5,202.20 = 1,128.40/x
3. Step 3: Cross multiply
   3,469.01x = 5,202.20 × 1,128.40
4. Step 4: Simplify right side
   3,469.01x = 5,870,152.30
5. Step 5: Solve for x
   x = 5,870,152.30/3,469.01
6. Step 6: Final answer
   x = 1,692.17