Finding the Fourth Proportional to 12,379, 18,554.35 and 4,978.73

Step by Step Solution

1. Step 1: Write the proportion equation
   12,379 : 18,554.35 = 4,978.73 : x
2. Step 2: Convert to fraction form
   12,379/18,554.35 = 4,978.73/x
3. Step 3: Cross multiply
   12,379x = 18,554.35 × 4,978.73
4. Step 4: Simplify right side
   12,379x = 92,377,098.98
5. Step 5: Solve for x
   x = 92,377,098.98/12,379
6. Step 6: Final answer
   x = 7,462.40