Finding the Fourth Proportional to 3,993.78, 5,985.20 and 2,530.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,993.78 : 5,985.20 = 2,530.31 : x
2. Step 2: Convert to fraction form
   3,993.78/5,985.20 = 2,530.31/x
3. Step 3: Cross multiply
   3,993.78x = 5,985.20 × 2,530.31
4. Step 4: Simplify right side
   3,993.78x = 15,144,441.87
5. Step 5: Solve for x
   x = 15,144,441.87/3,993.78
6. Step 6: Final answer
   x = 3,792.01