Finding the Fourth Proportional to 3,978.37, 5,488.72 and 2,385.10

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.37 : 5,488.72 = 2,385.10 : x
2. Step 2: Convert to fraction form
   3,978.37/5,488.72 = 2,385.10/x
3. Step 3: Cross multiply
   3,978.37x = 5,488.72 × 2,385.10
4. Step 4: Simplify right side
   3,978.37x = 13,091,146.07
5. Step 5: Solve for x
   x = 13,091,146.07/3,978.37
6. Step 6: Final answer
   x = 3,290.58