Finding the Fourth Proportional to 1,128.38, 1,692.59 and 306.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.38 : 1,692.59 = 306.72 : x
2. Step 2: Convert to fraction form
   1,128.38/1,692.59 = 306.72/x
3. Step 3: Cross multiply
   1,128.38x = 1,692.59 × 306.72
4. Step 4: Simplify right side
   1,128.38x = 519,149.67
5. Step 5: Solve for x
   x = 519,149.67/1,128.38
6. Step 6: Final answer
   x = 460.09