Finding the Fourth Proportional to 12,947.27, 19,421.71 and 5,155.88

Step by Step Solution

1. Step 1: Write the proportion equation
   12,947.27 : 19,421.71 = 5,155.88 : x
2. Step 2: Convert to fraction form
   12,947.27/19,421.71 = 5,155.88/x
3. Step 3: Cross multiply
   12,947.27x = 19,421.71 × 5,155.88
4. Step 4: Simplify right side
   12,947.27x = 100,135,896.16
5. Step 5: Solve for x
   x = 100,135,896.16/12,947.27
6. Step 6: Final answer
   x = 7,734.14