Finding the Fourth Proportional to 12,977.15, 19,471.86 and 7,722.54

Step by Step Solution

1. Step 1: Write the proportion equation
   12,977.15 : 19,471.86 = 7,722.54 : x
2. Step 2: Convert to fraction form
   12,977.15/19,471.86 = 7,722.54/x
3. Step 3: Cross multiply
   12,977.15x = 19,471.86 × 7,722.54
4. Step 4: Simplify right side
   12,977.15x = 150,372,217.72
5. Step 5: Solve for x
   x = 150,372,217.72/12,977.15
6. Step 6: Final answer
   x = 11,587.47