Finding the Fourth Proportional to 12,817.86, 17,688.78 and 7,153.14

Step by Step Solution

1. Step 1: Write the proportion equation
   12,817.86 : 17,688.78 = 7,153.14 : x
2. Step 2: Convert to fraction form
   12,817.86/17,688.78 = 7,153.14/x
3. Step 3: Cross multiply
   12,817.86x = 17,688.78 × 7,153.14
4. Step 4: Simplify right side
   12,817.86x = 126,530,319.77
5. Step 5: Solve for x
   x = 126,530,319.77/12,817.86
6. Step 6: Final answer
   x = 9,871.41