Finding the Fourth Proportional to 8,411.74, 12,628.77 and 7,187.02

Step by Step Solution

1. Step 1: Write the proportion equation
   8,411.74 : 12,628.77 = 7,187.02 : x
2. Step 2: Convert to fraction form
   8,411.74/12,628.77 = 7,187.02/x
3. Step 3: Cross multiply
   8,411.74x = 12,628.77 × 7,187.02
4. Step 4: Simplify right side
   8,411.74x = 90,763,222.57
5. Step 5: Solve for x
   x = 90,763,222.57/8,411.74
6. Step 6: Final answer
   x = 10,790.07