Finding the Fourth Proportional to 13,851.58, 20,780.20 and 5,086.56

Step by Step Solution

1. Step 1: Write the proportion equation
   13,851.58 : 20,780.20 = 5,086.56 : x
2. Step 2: Convert to fraction form
   13,851.58/20,780.20 = 5,086.56/x
3. Step 3: Cross multiply
   13,851.58x = 20,780.20 × 5,086.56
4. Step 4: Simplify right side
   13,851.58x = 105,699,734.11
5. Step 5: Solve for x
   x = 105,699,734.11/13,851.58
6. Step 6: Final answer
   x = 7,630.88