Finding the Fourth Proportional to 3,978.06, 5,960.97 and 2,129.46

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.06 : 5,960.97 = 2,129.46 : x
2. Step 2: Convert to fraction form
   3,978.06/5,960.97 = 2,129.46/x
3. Step 3: Cross multiply
   3,978.06x = 5,960.97 × 2,129.46
4. Step 4: Simplify right side
   3,978.06x = 12,693,647.18
5. Step 5: Solve for x
   x = 12,693,647.18/3,978.06
6. Step 6: Final answer
   x = 3,190.91