Finding the Fourth Proportional to 12,456.42, 18,659.10 and 9,977.82

Step by Step Solution

1. Step 1: Write the proportion equation
   12,456.42 : 18,659.10 = 9,977.82 : x
2. Step 2: Convert to fraction form
   12,456.42/18,659.10 = 9,977.82/x
3. Step 3: Cross multiply
   12,456.42x = 18,659.10 × 9,977.82
4. Step 4: Simplify right side
   12,456.42x = 186,177,141.16
5. Step 5: Solve for x
   x = 186,177,141.16/12,456.42
6. Step 6: Final answer
   x = 14,946.28