Finding the Fourth Proportional to 8,290.71, 12,437.89 and 3,908.21

Step by Step Solution

1. Step 1: Write the proportion equation
   8,290.71 : 12,437.89 = 3,908.21 : x
2. Step 2: Convert to fraction form
   8,290.71/12,437.89 = 3,908.21/x
3. Step 3: Cross multiply
   8,290.71x = 12,437.89 × 3,908.21
4. Step 4: Simplify right side
   8,290.71x = 48,609,814.12
5. Step 5: Solve for x
   x = 48,609,814.12/8,290.71
6. Step 6: Final answer
   x = 5,863.17