Finding the Fourth Proportional to 12,315.06, 16,991.46 and 7,009.74

Step by Step Solution

1. Step 1: Write the proportion equation
   12,315.06 : 16,991.46 = 7,009.74 : x
2. Step 2: Convert to fraction form
   12,315.06/16,991.46 = 7,009.74/x
3. Step 3: Cross multiply
   12,315.06x = 16,991.46 × 7,009.74
4. Step 4: Simplify right side
   12,315.06x = 119,105,716.82
5. Step 5: Solve for x
   x = 119,105,716.82/12,315.06
6. Step 6: Final answer
   x = 9,671.55