Finding the Fourth Proportional to 10,901.25, 16,357.78 and 8,440.88

Step by Step Solution

1. Step 1: Write the proportion equation
   10,901.25 : 16,357.78 = 8,440.88 : x
2. Step 2: Convert to fraction form
   10,901.25/16,357.78 = 8,440.88/x
3. Step 3: Cross multiply
   10,901.25x = 16,357.78 × 8,440.88
4. Step 4: Simplify right side
   10,901.25x = 138,073,986.81
5. Step 5: Solve for x
   x = 138,073,986.81/10,901.25
6. Step 6: Final answer
   x = 12,665.89