Finding the Fourth Proportional to 8,131.78, 12,205.35 and 5,059.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,131.78 : 12,205.35 = 5,059.78 : x
2. Step 2: Convert to fraction form
   8,131.78/12,205.35 = 5,059.78/x
3. Step 3: Cross multiply
   8,131.78x = 12,205.35 × 5,059.78
4. Step 4: Simplify right side
   8,131.78x = 61,756,385.82
5. Step 5: Solve for x
   x = 61,756,385.82/8,131.78
6. Step 6: Final answer
   x = 7,594.45