Finding the Fourth Proportional to 8,632.35, 12,929.36 and 8,422.83

Step by Step Solution

1. Step 1: Write the proportion equation
   8,632.35 : 12,929.36 = 8,422.83 : x
2. Step 2: Convert to fraction form
   8,632.35/12,929.36 = 8,422.83/x
3. Step 3: Cross multiply
   8,632.35x = 12,929.36 × 8,422.83
4. Step 4: Simplify right side
   8,632.35x = 108,901,759.17
5. Step 5: Solve for x
   x = 108,901,759.17/8,632.35
6. Step 6: Final answer
   x = 12,615.54