Finding the Fourth Proportional to 13,205.16, 19,805.58 and 3,969

Step by Step Solution

1. Step 1: Write the proportion equation
   13,205.16 : 19,805.58 = 3,969 : x
2. Step 2: Convert to fraction form
   13,205.16/19,805.58 = 3,969/x
3. Step 3: Cross multiply
   13,205.16x = 19,805.58 × 3,969
4. Step 4: Simplify right side
   13,205.16x = 78,608,347.02
5. Step 5: Solve for x
   x = 78,608,347.02/13,205.16
6. Step 6: Final answer
   x = 5,952.85