Finding the Fourth Proportional to 7,128.06, 10,692.18 and 3,429.60

Step by Step Solution

1. Step 1: Write the proportion equation
   7,128.06 : 10,692.18 = 3,429.60 : x
2. Step 2: Convert to fraction form
   7,128.06/10,692.18 = 3,429.60/x
3. Step 3: Cross multiply
   7,128.06x = 10,692.18 × 3,429.60
4. Step 4: Simplify right side
   7,128.06x = 36,669,900.53
5. Step 5: Solve for x
   x = 36,669,900.53/7,128.06
6. Step 6: Final answer
   x = 5,144.44