Finding the Fourth Proportional to 4,128.72, 6,191.64 and 2,485.56

Step by Step Solution

1. Step 1: Write the proportion equation
   4,128.72 : 6,191.64 = 2,485.56 : x
2. Step 2: Convert to fraction form
   4,128.72/6,191.64 = 2,485.56/x
3. Step 3: Cross multiply
   4,128.72x = 6,191.64 × 2,485.56
4. Step 4: Simplify right side
   4,128.72x = 15,389,692.72
5. Step 5: Solve for x
   x = 15,389,692.72/4,128.72
6. Step 6: Final answer
   x = 3,727.47