Finding the Fourth Proportional to 10,961.72, 15,109.30 and 6,975.91

Step by Step Solution

1. Step 1: Write the proportion equation
   10,961.72 : 15,109.30 = 6,975.91 : x
2. Step 2: Convert to fraction form
   10,961.72/15,109.30 = 6,975.91/x
3. Step 3: Cross multiply
   10,961.72x = 15,109.30 × 6,975.91
4. Step 4: Simplify right side
   10,961.72x = 105,401,116.96
5. Step 5: Solve for x
   x = 105,401,116.96/10,961.72
6. Step 6: Final answer
   x = 9,615.38