Finding the Fourth Proportional to 8,621.77, 12,949.06 and 5,357.67

Step by Step Solution

1. Step 1: Write the proportion equation
   8,621.77 : 12,949.06 = 5,357.67 : x
2. Step 2: Convert to fraction form
   8,621.77/12,949.06 = 5,357.67/x
3. Step 3: Cross multiply
   8,621.77x = 12,949.06 × 5,357.67
4. Step 4: Simplify right side
   8,621.77x = 69,376,796.15
5. Step 5: Solve for x
   x = 69,376,796.15/8,621.77
6. Step 6: Final answer
   x = 8,046.70