Finding the Fourth Proportional to 1,128.37, 1,692.12 and 667.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.37 : 1,692.12 = 667.09 : x
2. Step 2: Convert to fraction form
   1,128.37/1,692.12 = 667.09/x
3. Step 3: Cross multiply
   1,128.37x = 1,692.12 × 667.09
4. Step 4: Simplify right side
   1,128.37x = 1,128,796.33
5. Step 5: Solve for x
   x = 1,128,796.33/1,128.37
6. Step 6: Final answer
   x = 1,000.38