Finding the Fourth Proportional to 9,801.53, 14,721.20 and 8,399.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,801.53 : 14,721.20 = 8,399.12 : x
2. Step 2: Convert to fraction form
   9,801.53/14,721.20 = 8,399.12/x
3. Step 3: Cross multiply
   9,801.53x = 14,721.20 × 8,399.12
4. Step 4: Simplify right side
   9,801.53x = 123,645,083.35
5. Step 5: Solve for x
   x = 123,645,083.35/9,801.53
6. Step 6: Final answer
   x = 12,614.88