Finding the Fourth Proportional to 12,945.54, 19,418.28 and 5,152.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,945.54 : 19,418.28 = 5,152.50 : x
2. Step 2: Convert to fraction form
   12,945.54/19,418.28 = 5,152.50/x
3. Step 3: Cross multiply
   12,945.54x = 19,418.28 × 5,152.50
4. Step 4: Simplify right side
   12,945.54x = 100,052,687.70
5. Step 5: Solve for x
   x = 100,052,687.70/12,945.54
6. Step 6: Final answer
   x = 7,728.74