Finding the Fourth Proportional to 10,971.59, 15,142.17 and 8,451.68

Step by Step Solution

1. Step 1: Write the proportion equation
   10,971.59 : 15,142.17 = 8,451.68 : x
2. Step 2: Convert to fraction form
   10,971.59/15,142.17 = 8,451.68/x
3. Step 3: Cross multiply
   10,971.59x = 15,142.17 × 8,451.68
4. Step 4: Simplify right side
   10,971.59x = 127,976,775.35
5. Step 5: Solve for x
   x = 127,976,775.35/10,971.59
6. Step 6: Final answer
   x = 11,664.38