Finding the Fourth Proportional to 12,905.88, 17,812.56 and 8,433.47

Step by Step Solution

1. Step 1: Write the proportion equation
   12,905.88 : 17,812.56 = 8,433.47 : x
2. Step 2: Convert to fraction form
   12,905.88/17,812.56 = 8,433.47/x
3. Step 3: Cross multiply
   12,905.88x = 17,812.56 × 8,433.47
4. Step 4: Simplify right side
   12,905.88x = 150,221,601.32
5. Step 5: Solve for x
   x = 150,221,601.32/12,905.88
6. Step 6: Final answer
   x = 11,639.78