Finding the Fourth Proportional to 12,447.36, 17,164.17 and 7,971.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,447.36 : 17,164.17 = 7,971.30 : x
2. Step 2: Convert to fraction form
   12,447.36/17,164.17 = 7,971.30/x
3. Step 3: Cross multiply
   12,447.36x = 17,164.17 × 7,971.30
4. Step 4: Simplify right side
   12,447.36x = 136,820,748.32
5. Step 5: Solve for x
   x = 136,820,748.32/12,447.36
6. Step 6: Final answer
   x = 10,991.95