Finding the Fourth Proportional to 12,456.18, 18,677.67 and 3,689.82

Step by Step Solution

1. Step 1: Write the proportion equation
   12,456.18 : 18,677.67 = 3,689.82 : x
2. Step 2: Convert to fraction form
   12,456.18/18,677.67 = 3,689.82/x
3. Step 3: Cross multiply
   12,456.18x = 18,677.67 × 3,689.82
4. Step 4: Simplify right side
   12,456.18x = 68,917,240.32
5. Step 5: Solve for x
   x = 68,917,240.32/12,456.18
6. Step 6: Final answer
   x = 5,532.77