Finding the Fourth Proportional to 8,296.74, 12,415.86 and 5,178.21

Step by Step Solution

1. Step 1: Write the proportion equation
   8,296.74 : 12,415.86 = 5,178.21 : x
2. Step 2: Convert to fraction form
   8,296.74/12,415.86 = 5,178.21/x
3. Step 3: Cross multiply
   8,296.74x = 12,415.86 × 5,178.21
4. Step 4: Simplify right side
   8,296.74x = 64,291,903.27
5. Step 5: Solve for x
   x = 64,291,903.27/8,296.74
6. Step 6: Final answer
   x = 7,749.06