Finding the Fourth Proportional to 13,127.25, 18,115.61 and 8,417.91

Step by Step Solution

1. Step 1: Write the proportion equation
   13,127.25 : 18,115.61 = 8,417.91 : x
2. Step 2: Convert to fraction form
   13,127.25/18,115.61 = 8,417.91/x
3. Step 3: Cross multiply
   13,127.25x = 18,115.61 × 8,417.91
4. Step 4: Simplify right side
   13,127.25x = 152,495,574.58
5. Step 5: Solve for x
   x = 152,495,574.58/13,127.25
6. Step 6: Final answer
   x = 11,616.72