Finding the Fourth Proportional to 13,870.49, 20,810.99 and 8,327.71

Step by Step Solution

1. Step 1: Write the proportion equation
   13,870.49 : 20,810.99 = 8,327.71 : x
2. Step 2: Convert to fraction form
   13,870.49/20,810.99 = 8,327.71/x
3. Step 3: Cross multiply
   13,870.49x = 20,810.99 × 8,327.71
4. Step 4: Simplify right side
   13,870.49x = 173,307,858.32
5. Step 5: Solve for x
   x = 173,307,858.32/13,870.49
6. Step 6: Final answer
   x = 12,494.72