Finding the Fourth Proportional to 8,540.88, 12,811.98 and 3,278.42

Step by Step Solution

1. Step 1: Write the proportion equation
   8,540.88 : 12,811.98 = 3,278.42 : x
2. Step 2: Convert to fraction form
   8,540.88/12,811.98 = 3,278.42/x
3. Step 3: Cross multiply
   8,540.88x = 12,811.98 × 3,278.42
4. Step 4: Simplify right side
   8,540.88x = 42,003,051.47
5. Step 5: Solve for x
   x = 42,003,051.47/8,540.88
6. Step 6: Final answer
   x = 4,917.88