Finding the Fourth Proportional to 3,840.78, 5,300.78 and 2,162.51

Step by Step Solution

1. Step 1: Write the proportion equation
   3,840.78 : 5,300.78 = 2,162.51 : x
2. Step 2: Convert to fraction form
   3,840.78/5,300.78 = 2,162.51/x
3. Step 3: Cross multiply
   3,840.78x = 5,300.78 × 2,162.51
4. Step 4: Simplify right side
   3,840.78x = 11,463,000.31
5. Step 5: Solve for x
   x = 11,463,000.31/3,840.78
6. Step 6: Final answer
   x = 2,984.55