Finding the Fourth Proportional to 9,936.79, 14,909.25 and 5,255.53

Step by Step Solution

1. Step 1: Write the proportion equation
   9,936.79 : 14,909.25 = 5,255.53 : x
2. Step 2: Convert to fraction form
   9,936.79/14,909.25 = 5,255.53/x
3. Step 3: Cross multiply
   9,936.79x = 14,909.25 × 5,255.53
4. Step 4: Simplify right side
   9,936.79x = 78,356,010.65
5. Step 5: Solve for x
   x = 78,356,010.65/9,936.79
6. Step 6: Final answer
   x = 7,885.44