Finding the Fourth Proportional to 9,109.35, 12,568.61 and 6,987.05

Step by Step Solution

1. Step 1: Write the proportion equation
   9,109.35 : 12,568.61 = 6,987.05 : x
2. Step 2: Convert to fraction form
   9,109.35/12,568.61 = 6,987.05/x
3. Step 3: Cross multiply
   9,109.35x = 12,568.61 × 6,987.05
4. Step 4: Simplify right side
   9,109.35x = 87,817,408.72
5. Step 5: Solve for x
   x = 87,817,408.72/9,109.35
6. Step 6: Final answer
   x = 9,640.36