Finding the Fourth Proportional to 12,904.86, 17,814.15 and 8,718.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,904.86 : 17,814.15 = 8,718.78 : x
2. Step 2: Convert to fraction form
   12,904.86/17,814.15 = 8,718.78/x
3. Step 3: Cross multiply
   12,904.86x = 17,814.15 × 8,718.78
4. Step 4: Simplify right side
   12,904.86x = 155,317,654.74
5. Step 5: Solve for x
   x = 155,317,654.74/12,904.86
6. Step 6: Final answer
   x = 12,035.59