Finding the Fourth Proportional to 12,947.58, 17,856.59 and 8,920.83

Step by Step Solution

1. Step 1: Write the proportion equation
   12,947.58 : 17,856.59 = 8,920.83 : x
2. Step 2: Convert to fraction form
   12,947.58/17,856.59 = 8,920.83/x
3. Step 3: Cross multiply
   12,947.58x = 17,856.59 × 8,920.83
4. Step 4: Simplify right side
   12,947.58x = 159,295,559.17
5. Step 5: Solve for x
   x = 159,295,559.17/12,947.58
6. Step 6: Final answer
   x = 12,303.11