Finding the Fourth Proportional to 12,945.49, 19,422.01 and 5,155.45

Step by Step Solution

1. Step 1: Write the proportion equation
   12,945.49 : 19,422.01 = 5,155.45 : x
2. Step 2: Convert to fraction form
   12,945.49/19,422.01 = 5,155.45/x
3. Step 3: Cross multiply
   12,945.49x = 19,422.01 × 5,155.45
4. Step 4: Simplify right side
   12,945.49x = 100,129,201.45
5. Step 5: Solve for x
   x = 100,129,201.45/12,945.49
6. Step 6: Final answer
   x = 7,734.68