Finding the Fourth Proportional to 3,784.31, 5,222.37 and 2,128.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,784.31 : 5,222.37 = 2,128.31 : x
2. Step 2: Convert to fraction form
   3,784.31/5,222.37 = 2,128.31/x
3. Step 3: Cross multiply
   3,784.31x = 5,222.37 × 2,128.31
4. Step 4: Simplify right side
   3,784.31x = 11,114,843.33
5. Step 5: Solve for x
   x = 11,114,843.33/3,784.31
6. Step 6: Final answer
   x = 2,937.08