Finding the Fourth Proportional to 12,315.70, 16,987.89 and 7,009.39

Step by Step Solution

1. Step 1: Write the proportion equation
   12,315.70 : 16,987.89 = 7,009.39 : x
2. Step 2: Convert to fraction form
   12,315.70/16,987.89 = 7,009.39/x
3. Step 3: Cross multiply
   12,315.70x = 16,987.89 × 7,009.39
4. Step 4: Simplify right side
   12,315.70x = 119,074,746.29
5. Step 5: Solve for x
   x = 119,074,746.29/12,315.70
6. Step 6: Final answer
   x = 9,668.53