Finding the Fourth Proportional to 13,906.72, 20,859.89 and 3,376.81

Step by Step Solution

1. Step 1: Write the proportion equation
   13,906.72 : 20,859.89 = 3,376.81 : x
2. Step 2: Convert to fraction form
   13,906.72/20,859.89 = 3,376.81/x
3. Step 3: Cross multiply
   13,906.72x = 20,859.89 × 3,376.81
4. Step 4: Simplify right side
   13,906.72x = 70,439,885.15
5. Step 5: Solve for x
   x = 70,439,885.15/13,906.72
6. Step 6: Final answer
   x = 5,065.17