Finding the Fourth Proportional to 9,162.59, 12,643.49 and 7,278.73

Step by Step Solution

1. Step 1: Write the proportion equation
   9,162.59 : 12,643.49 = 7,278.73 : x
2. Step 2: Convert to fraction form
   9,162.59/12,643.49 = 7,278.73/x
3. Step 3: Cross multiply
   9,162.59x = 12,643.49 × 7,278.73
4. Step 4: Simplify right side
   9,162.59x = 92,028,536.56
5. Step 5: Solve for x
   x = 92,028,536.56/9,162.59
6. Step 6: Final answer
   x = 10,043.95