Finding the Fourth Proportional to 12,978.88, 17,911.73 and 7,314.09

Step by Step Solution

1. Step 1: Write the proportion equation
   12,978.88 : 17,911.73 = 7,314.09 : x
2. Step 2: Convert to fraction form
   12,978.88/17,911.73 = 7,314.09/x
3. Step 3: Cross multiply
   12,978.88x = 17,911.73 × 7,314.09
4. Step 4: Simplify right side
   12,978.88x = 131,008,023.56
5. Step 5: Solve for x
   x = 131,008,023.56/12,978.88
6. Step 6: Final answer
   x = 10,093.94