Finding the Fourth Proportional to 12,807, 17,688.24 and 8,607.96

Step by Step Solution

1. Step 1: Write the proportion equation
   12,807 : 17,688.24 = 8,607.96 : x
2. Step 2: Convert to fraction form
   12,807/17,688.24 = 8,607.96/x
3. Step 3: Cross multiply
   12,807x = 17,688.24 × 8,607.96
4. Step 4: Simplify right side
   12,807x = 152,259,662.39
5. Step 5: Solve for x
   x = 152,259,662.39/12,807
6. Step 6: Final answer
   x = 11,888.78