Finding the Fourth Proportional to 12,315.12, 17,009.01 and 8,972.88

Step by Step Solution

1. Step 1: Write the proportion equation
   12,315.12 : 17,009.01 = 8,972.88 : x
2. Step 2: Convert to fraction form
   12,315.12/17,009.01 = 8,972.88/x
3. Step 3: Cross multiply
   12,315.12x = 17,009.01 × 8,972.88
4. Step 4: Simplify right side
   12,315.12x = 152,619,805.65
5. Step 5: Solve for x
   x = 152,619,805.65/12,315.12
6. Step 6: Final answer
   x = 12,392.88