Finding the Fourth Proportional to 12,654.30, 17,478.38 and 8,688.54

Step by Step Solution

1. Step 1: Write the proportion equation
   12,654.30 : 17,478.38 = 8,688.54 : x
2. Step 2: Convert to fraction form
   12,654.30/17,478.38 = 8,688.54/x
3. Step 3: Cross multiply
   12,654.30x = 17,478.38 × 8,688.54
4. Step 4: Simplify right side
   12,654.30x = 151,861,603.77
5. Step 5: Solve for x
   x = 151,861,603.77/12,654.30
6. Step 6: Final answer
   x = 12,000.79