Finding the Fourth Proportional to 8,221.35, 12,326.33 and 5,261.61

Step by Step Solution

1. Step 1: Write the proportion equation
   8,221.35 : 12,326.33 = 5,261.61 : x
2. Step 2: Convert to fraction form
   8,221.35/12,326.33 = 5,261.61/x
3. Step 3: Cross multiply
   8,221.35x = 12,326.33 × 5,261.61
4. Step 4: Simplify right side
   8,221.35x = 64,856,314.88
5. Step 5: Solve for x
   x = 64,856,314.88/8,221.35
6. Step 6: Final answer
   x = 7,888.77