Finding the Fourth Proportional to 10,907.12, 16,359.06 and 3,980

Step by Step Solution

1. Step 1: Write the proportion equation
   10,907.12 : 16,359.06 = 3,980 : x
2. Step 2: Convert to fraction form
   10,907.12/16,359.06 = 3,980/x
3. Step 3: Cross multiply
   10,907.12x = 16,359.06 × 3,980
4. Step 4: Simplify right side
   10,907.12x = 65,109,058.80
5. Step 5: Solve for x
   x = 65,109,058.80/10,907.12
6. Step 6: Final answer
   x = 5,969.41