Finding the Fourth Proportional to 1,128.43, 1,692.41 and 306.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.43 : 1,692.41 = 306.72 : x
2. Step 2: Convert to fraction form
   1,128.43/1,692.41 = 306.72/x
3. Step 3: Cross multiply
   1,128.43x = 1,692.41 × 306.72
4. Step 4: Simplify right side
   1,128.43x = 519,096.00
5. Step 5: Solve for x
   x = 519,096.00/1,128.43
6. Step 6: Final answer
   x = 460.02