Finding the Fourth Proportional to 8,354.82, 12,521.31 and 3,421.77

Step by Step Solution

1. Step 1: Write the proportion equation
   8,354.82 : 12,521.31 = 3,421.77 : x
2. Step 2: Convert to fraction form
   8,354.82/12,521.31 = 3,421.77/x
3. Step 3: Cross multiply
   8,354.82x = 12,521.31 × 3,421.77
4. Step 4: Simplify right side
   8,354.82x = 42,845,042.92
5. Step 5: Solve for x
   x = 42,845,042.92/8,354.82
6. Step 6: Final answer
   x = 5,128.18