Finding the Fourth Proportional to 10,947.23, 16,405.56 and 8,276.61

Step by Step Solution

1. Step 1: Write the proportion equation
   10,947.23 : 16,405.56 = 8,276.61 : x
2. Step 2: Convert to fraction form
   10,947.23/16,405.56 = 8,276.61/x
3. Step 3: Cross multiply
   10,947.23x = 16,405.56 × 8,276.61
4. Step 4: Simplify right side
   10,947.23x = 135,782,368.33
5. Step 5: Solve for x
   x = 135,782,368.33/10,947.23
6. Step 6: Final answer
   x = 12,403.36