Finding the Fourth Proportional to 3,784.82, 5,222.45 and 2,128.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,784.82 : 5,222.45 = 2,128.50 : x
2. Step 2: Convert to fraction form
   3,784.82/5,222.45 = 2,128.50/x
3. Step 3: Cross multiply
   3,784.82x = 5,222.45 × 2,128.50
4. Step 4: Simplify right side
   3,784.82x = 11,115,984.83
5. Step 5: Solve for x
   x = 11,115,984.83/3,784.82
6. Step 6: Final answer
   x = 2,936.99