Finding the Fourth Proportional to 12,945.76, 19,418.72 and 5,154.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,945.76 : 19,418.72 = 5,154.56 : x
2. Step 2: Convert to fraction form
   12,945.76/19,418.72 = 5,154.56/x
3. Step 3: Cross multiply
   12,945.76x = 19,418.72 × 5,154.56
4. Step 4: Simplify right side
   12,945.76x = 100,094,957.36
5. Step 5: Solve for x
   x = 100,094,957.36/12,945.76
6. Step 6: Final answer
   x = 7,731.87