Finding the Fourth Proportional to 12,780.27, 17,636.81 and 7,191.27

Step by Step Solution

1. Step 1: Write the proportion equation
   12,780.27 : 17,636.81 = 7,191.27 : x
2. Step 2: Convert to fraction form
   12,780.27/17,636.81 = 7,191.27/x
3. Step 3: Cross multiply
   12,780.27x = 17,636.81 × 7,191.27
4. Step 4: Simplify right side
   12,780.27x = 126,831,026.69
5. Step 5: Solve for x
   x = 126,831,026.69/12,780.27
6. Step 6: Final answer
   x = 9,923.97