Finding the Fourth Proportional to 1,128.44, 1,692.72 and 478.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.44 : 1,692.72 = 478.52 : x
2. Step 2: Convert to fraction form
   1,128.44/1,692.72 = 478.52/x
3. Step 3: Cross multiply
   1,128.44x = 1,692.72 × 478.52
4. Step 4: Simplify right side
   1,128.44x = 810,000.37
5. Step 5: Solve for x
   x = 810,000.37/1,128.44
6. Step 6: Final answer
   x = 717.81