Finding the Fourth Proportional to 8,930.72, 12,318.90 and 5,905.82

Step by Step Solution

1. Step 1: Write the proportion equation
   8,930.72 : 12,318.90 = 5,905.82 : x
2. Step 2: Convert to fraction form
   8,930.72/12,318.90 = 5,905.82/x
3. Step 3: Cross multiply
   8,930.72x = 12,318.90 × 5,905.82
4. Step 4: Simplify right side
   8,930.72x = 72,753,206.00
5. Step 5: Solve for x
   x = 72,753,206.00/8,930.72
6. Step 6: Final answer
   x = 8,146.40