Finding the Fourth Proportional to 10,986.17, 16,480.06 and 3,970.35

Step by Step Solution

1. Step 1: Write the proportion equation
   10,986.17 : 16,480.06 = 3,970.35 : x
2. Step 2: Convert to fraction form
   10,986.17/16,480.06 = 3,970.35/x
3. Step 3: Cross multiply
   10,986.17x = 16,480.06 × 3,970.35
4. Step 4: Simplify right side
   10,986.17x = 65,431,596.30
5. Step 5: Solve for x
   x = 65,431,596.30/10,986.17
6. Step 6: Final answer
   x = 5,955.82