Finding the Fourth Proportional to 3,784.42, 5,222.46 and 2,128.42

Step by Step Solution

1. Step 1: Write the proportion equation
   3,784.42 : 5,222.46 = 2,128.42 : x
2. Step 2: Convert to fraction form
   3,784.42/5,222.46 = 2,128.42/x
3. Step 3: Cross multiply
   3,784.42x = 5,222.46 × 2,128.42
4. Step 4: Simplify right side
   3,784.42x = 11,115,588.31
5. Step 5: Solve for x
   x = 11,115,588.31/3,784.42
6. Step 6: Final answer
   x = 2,937.20