Finding the Fourth Proportional to 3,128.80, 4,692.50 and 937.25

Step by Step Solution

1. Step 1: Write the proportion equation
   3,128.80 : 4,692.50 = 937.25 : x
2. Step 2: Convert to fraction form
   3,128.80/4,692.50 = 937.25/x
3. Step 3: Cross multiply
   3,128.80x = 4,692.50 × 937.25
4. Step 4: Simplify right side
   3,128.80x = 4,398,017.48
5. Step 5: Solve for x
   x = 4,398,017.48/3,128.80
6. Step 6: Final answer
   x = 1,405.66