Finding the Fourth Proportional to 13,309.18, 19,967.93 and 3,949.25

Step by Step Solution

1. Step 1: Write the proportion equation
   13,309.18 : 19,967.93 = 3,949.25 : x
2. Step 2: Convert to fraction form
   13,309.18/19,967.93 = 3,949.25/x
3. Step 3: Cross multiply
   13,309.18x = 19,967.93 × 3,949.25
4. Step 4: Simplify right side
   13,309.18x = 78,858,242.78
5. Step 5: Solve for x
   x = 78,858,242.78/13,309.18
6. Step 6: Final answer
   x = 5,925.10