Finding the Fourth Proportional to 3,978.07, 5,489.73 and 2,406.16

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.07 : 5,489.73 = 2,406.16 : x
2. Step 2: Convert to fraction form
   3,978.07/5,489.73 = 2,406.16/x
3. Step 3: Cross multiply
   3,978.07x = 5,489.73 × 2,406.16
4. Step 4: Simplify right side
   3,978.07x = 13,209,168.74
5. Step 5: Solve for x
   x = 13,209,168.74/3,978.07
6. Step 6: Final answer
   x = 3,320.50