Finding the Fourth Proportional to 3,784.88, 5,223.86 and 2,128.88

Step by Step Solution

1. Step 1: Write the proportion equation
   3,784.88 : 5,223.86 = 2,128.88 : x
2. Step 2: Convert to fraction form
   3,784.88/5,223.86 = 2,128.88/x
3. Step 3: Cross multiply
   3,784.88x = 5,223.86 × 2,128.88
4. Step 4: Simplify right side
   3,784.88x = 11,120,934.31
5. Step 5: Solve for x
   x = 11,120,934.31/3,784.88
6. Step 6: Final answer
   x = 2,938.26