Finding the Fourth Proportional to 3,851.37, 5,320.16 and 2,978.19

Step by Step Solution

1. Step 1: Write the proportion equation
   3,851.37 : 5,320.16 = 2,978.19 : x
2. Step 2: Convert to fraction form
   3,851.37/5,320.16 = 2,978.19/x
3. Step 3: Cross multiply
   3,851.37x = 5,320.16 × 2,978.19
4. Step 4: Simplify right side
   3,851.37x = 15,844,447.31
5. Step 5: Solve for x
   x = 15,844,447.31/3,851.37
6. Step 6: Final answer
   x = 4,113.98