Finding the Fourth Proportional to 12,315.15, 16,990.69 and 7,008.64

Step by Step Solution

1. Step 1: Write the proportion equation
   12,315.15 : 16,990.69 = 7,008.64 : x
2. Step 2: Convert to fraction form
   12,315.15/16,990.69 = 7,008.64/x
3. Step 3: Cross multiply
   12,315.15x = 16,990.69 × 7,008.64
4. Step 4: Simplify right side
   12,315.15x = 119,081,629.56
5. Step 5: Solve for x
   x = 119,081,629.56/12,315.15
6. Step 6: Final answer
   x = 9,669.52