Finding the Fourth Proportional to 9,178.92, 12,665.76 and 5,145.96

Step by Step Solution

1. Step 1: Write the proportion equation
   9,178.92 : 12,665.76 = 5,145.96 : x
2. Step 2: Convert to fraction form
   9,178.92/12,665.76 = 5,145.96/x
3. Step 3: Cross multiply
   9,178.92x = 12,665.76 × 5,145.96
4. Step 4: Simplify right side
   9,178.92x = 65,177,494.33
5. Step 5: Solve for x
   x = 65,177,494.33/9,178.92
6. Step 6: Final answer
   x = 7,100.78