Finding the Fourth Proportional to 8,722.89, 12,042.06 and 5,905.17

Step by Step Solution

1. Step 1: Write the proportion equation
   8,722.89 : 12,042.06 = 5,905.17 : x
2. Step 2: Convert to fraction form
   8,722.89/12,042.06 = 5,905.17/x
3. Step 3: Cross multiply
   8,722.89x = 12,042.06 × 5,905.17
4. Step 4: Simplify right side
   8,722.89x = 71,110,411.45
5. Step 5: Solve for x
   x = 71,110,411.45/8,722.89
6. Step 6: Final answer
   x = 8,152.16