Finding the Fourth Proportional to 12,901.69, 17,787.63 and 8,356.29

Step by Step Solution

1. Step 1: Write the proportion equation
   12,901.69 : 17,787.63 = 8,356.29 : x
2. Step 2: Convert to fraction form
   12,901.69/17,787.63 = 8,356.29/x
3. Step 3: Cross multiply
   12,901.69x = 17,787.63 × 8,356.29
4. Step 4: Simplify right side
   12,901.69x = 148,638,594.69
5. Step 5: Solve for x
   x = 148,638,594.69/12,901.69
6. Step 6: Final answer
   x = 11,520.86