Finding the Fourth Proportional to 13,886.88, 20,824.72 and 5,119.86

Step by Step Solution

1. Step 1: Write the proportion equation
   13,886.88 : 20,824.72 = 5,119.86 : x
2. Step 2: Convert to fraction form
   13,886.88/20,824.72 = 5,119.86/x
3. Step 3: Cross multiply
   13,886.88x = 20,824.72 × 5,119.86
4. Step 4: Simplify right side
   13,886.88x = 106,619,650.94
5. Step 5: Solve for x
   x = 106,619,650.94/13,886.88
6. Step 6: Final answer
   x = 7,677.73