Finding the Fourth Proportional to 12,478.82, 18,718.01 and 3,118.89

Step by Step Solution

1. Step 1: Write the proportion equation
   12,478.82 : 18,718.01 = 3,118.89 : x
2. Step 2: Convert to fraction form
   12,478.82/18,718.01 = 3,118.89/x
3. Step 3: Cross multiply
   12,478.82x = 18,718.01 × 3,118.89
4. Step 4: Simplify right side
   12,478.82x = 58,379,398.61
5. Step 5: Solve for x
   x = 58,379,398.61/12,478.82
6. Step 6: Final answer
   x = 4,678.28