Finding the Fourth Proportional to 12,991.43, 19,455.25 and 8,297.58

Step by Step Solution

1. Step 1: Write the proportion equation
   12,991.43 : 19,455.25 = 8,297.58 : x
2. Step 2: Convert to fraction form
   12,991.43/19,455.25 = 8,297.58/x
3. Step 3: Cross multiply
   12,991.43x = 19,455.25 × 8,297.58
4. Step 4: Simplify right side
   12,991.43x = 161,431,493.30
5. Step 5: Solve for x
   x = 161,431,493.30/12,991.43
6. Step 6: Final answer
   x = 12,426.00