Finding the Fourth Proportional to 13,386.30, 20,081.98 and 5,381.69

Step by Step Solution

1. Step 1: Write the proportion equation
   13,386.30 : 20,081.98 = 5,381.69 : x
2. Step 2: Convert to fraction form
   13,386.30/20,081.98 = 5,381.69/x
3. Step 3: Cross multiply
   13,386.30x = 20,081.98 × 5,381.69
4. Step 4: Simplify right side
   13,386.30x = 108,074,890.54
5. Step 5: Solve for x
   x = 108,074,890.54/13,386.30
6. Step 6: Final answer
   x = 8,073.55