Finding the Fourth Proportional to 12,978.73, 17,910.66 and 7,010.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,978.73 : 17,910.66 = 7,010.40 : x
2. Step 2: Convert to fraction form
   12,978.73/17,910.66 = 7,010.40/x
3. Step 3: Cross multiply
   12,978.73x = 17,910.66 × 7,010.40
4. Step 4: Simplify right side
   12,978.73x = 125,560,952.56
5. Step 5: Solve for x
   x = 125,560,952.56/12,978.73
6. Step 6: Final answer
   x = 9,674.36