Finding the Fourth Proportional to 23,215.90, 34,815.69 and 8,422.30

Step by Step Solution

1. Step 1: Write the proportion equation
   23,215.90 : 34,815.69 = 8,422.30 : x
2. Step 2: Convert to fraction form
   23,215.90/34,815.69 = 8,422.30/x
3. Step 3: Cross multiply
   23,215.90x = 34,815.69 × 8,422.30
4. Step 4: Simplify right side
   23,215.90x = 293,228,185.89
5. Step 5: Solve for x
   x = 293,228,185.89/23,215.90
6. Step 6: Final answer
   x = 12,630.49