Finding the Fourth Proportional to 12,907.42, 17,818.53 and 8,656.93

Step by Step Solution

1. Step 1: Write the proportion equation
   12,907.42 : 17,818.53 = 8,656.93 : x
2. Step 2: Convert to fraction form
   12,907.42/17,818.53 = 8,656.93/x
3. Step 3: Cross multiply
   12,907.42x = 17,818.53 × 8,656.93
4. Step 4: Simplify right side
   12,907.42x = 154,253,766.91
5. Step 5: Solve for x
   x = 154,253,766.91/12,907.42
6. Step 6: Final answer
   x = 11,950.78