Finding the Fourth Proportional to 9,885.69, 14,728.70 and 9,415.49

Step by Step Solution

1. Step 1: Write the proportion equation
   9,885.69 : 14,728.70 = 9,415.49 : x
2. Step 2: Convert to fraction form
   9,885.69/14,728.70 = 9,415.49/x
3. Step 3: Cross multiply
   9,885.69x = 14,728.70 × 9,415.49
4. Step 4: Simplify right side
   9,885.69x = 138,677,877.46
5. Step 5: Solve for x
   x = 138,677,877.46/9,885.69
6. Step 6: Final answer
   x = 14,028.14