Finding the Fourth Proportional to 13,298.65, 19,949.83 and 3,939.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,298.65 : 19,949.83 = 3,939.50 : x
2. Step 2: Convert to fraction form
   13,298.65/19,949.83 = 3,939.50/x
3. Step 3: Cross multiply
   13,298.65x = 19,949.83 × 3,939.50
4. Step 4: Simplify right side
   13,298.65x = 78,592,395.31
5. Step 5: Solve for x
   x = 78,592,395.31/13,298.65
6. Step 6: Final answer
   x = 5,909.80