Finding the Fourth Proportional to 12,947.33, 17,870.27 and 9,166.57

Step by Step Solution

1. Step 1: Write the proportion equation
   12,947.33 : 17,870.27 = 9,166.57 : x
2. Step 2: Convert to fraction form
   12,947.33/17,870.27 = 9,166.57/x
3. Step 3: Cross multiply
   12,947.33x = 17,870.27 × 9,166.57
4. Step 4: Simplify right side
   12,947.33x = 163,809,080.87
5. Step 5: Solve for x
   x = 163,809,080.87/12,947.33
6. Step 6: Final answer
   x = 12,651.96