Finding the Fourth Proportional to 3,751.38, 5,139.36 and 3,611.20

Step by Step Solution

1. Step 1: Write the proportion equation
   3,751.38 : 5,139.36 = 3,611.20 : x
2. Step 2: Convert to fraction form
   3,751.38/5,139.36 = 3,611.20/x
3. Step 3: Cross multiply
   3,751.38x = 5,139.36 × 3,611.20
4. Step 4: Simplify right side
   3,751.38x = 18,559,256.83
5. Step 5: Solve for x
   x = 18,559,256.83/3,751.38
6. Step 6: Final answer
   x = 4,947.31