Finding the Fourth Proportional to 13,315.23, 19,965.89 and 3,953.96

Step by Step Solution

1. Step 1: Write the proportion equation
   13,315.23 : 19,965.89 = 3,953.96 : x
2. Step 2: Convert to fraction form
   13,315.23/19,965.89 = 3,953.96/x
3. Step 3: Cross multiply
   13,315.23x = 19,965.89 × 3,953.96
4. Step 4: Simplify right side
   13,315.23x = 78,944,315.35
5. Step 5: Solve for x
   x = 78,944,315.35/13,315.23
6. Step 6: Final answer
   x = 5,928.87