Finding the Fourth Proportional to 3,977.56, 5,488.38 and 2,485.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,977.56 : 5,488.38 = 2,485.72 : x
2. Step 2: Convert to fraction form
   3,977.56/5,488.38 = 2,485.72/x
3. Step 3: Cross multiply
   3,977.56x = 5,488.38 × 2,485.72
4. Step 4: Simplify right side
   3,977.56x = 13,642,575.93
5. Step 5: Solve for x
   x = 13,642,575.93/3,977.56
6. Step 6: Final answer
   x = 3,429.89