Finding the Fourth Proportional to 3,978.04, 5,965.24 and 2,128.84

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.04 : 5,965.24 = 2,128.84 : x
2. Step 2: Convert to fraction form
   3,978.04/5,965.24 = 2,128.84/x
3. Step 3: Cross multiply
   3,978.04x = 5,965.24 × 2,128.84
4. Step 4: Simplify right side
   3,978.04x = 12,699,041.52
5. Step 5: Solve for x
   x = 12,699,041.52/3,978.04
6. Step 6: Final answer
   x = 3,192.29