Finding the Fourth Proportional to 9,612.12, 14,354.07 and 9,120.09

Step by Step Solution

1. Step 1: Write the proportion equation
   9,612.12 : 14,354.07 = 9,120.09 : x
2. Step 2: Convert to fraction form
   9,612.12/14,354.07 = 9,120.09/x
3. Step 3: Cross multiply
   9,612.12x = 14,354.07 × 9,120.09
4. Step 4: Simplify right side
   9,612.12x = 130,910,410.27
5. Step 5: Solve for x
   x = 130,910,410.27/9,612.12
6. Step 6: Final answer
   x = 13,619.31