Finding the Fourth Proportional to 12,783.30, 19,072.28 and 11,379.98

Step by Step Solution

1. Step 1: Write the proportion equation
   12,783.30 : 19,072.28 = 11,379.98 : x
2. Step 2: Convert to fraction form
   12,783.30/19,072.28 = 11,379.98/x
3. Step 3: Cross multiply
   12,783.30x = 19,072.28 × 11,379.98
4. Step 4: Simplify right side
   12,783.30x = 217,042,012.69
5. Step 5: Solve for x
   x = 217,042,012.69/12,783.30
6. Step 6: Final answer
   x = 16,978.56