Finding the Fourth Proportional to 8,901.72, 12,284.72 and 5,912.40

Step by Step Solution

1. Step 1: Write the proportion equation
   8,901.72 : 12,284.72 = 5,912.40 : x
2. Step 2: Convert to fraction form
   8,901.72/12,284.72 = 5,912.40/x
3. Step 3: Cross multiply
   8,901.72x = 12,284.72 × 5,912.40
4. Step 4: Simplify right side
   8,901.72x = 72,632,178.53
5. Step 5: Solve for x
   x = 72,632,178.53/8,901.72
6. Step 6: Final answer
   x = 8,159.34