Finding the Fourth Proportional to 13,100.87, 18,085.41 and 8,387.89

Step by Step Solution

1. Step 1: Write the proportion equation
   13,100.87 : 18,085.41 = 8,387.89 : x
2. Step 2: Convert to fraction form
   13,100.87/18,085.41 = 8,387.89/x
3. Step 3: Cross multiply
   13,100.87x = 18,085.41 × 8,387.89
4. Step 4: Simplify right side
   13,100.87x = 151,698,384.47
5. Step 5: Solve for x
   x = 151,698,384.47/13,100.87
6. Step 6: Final answer
   x = 11,579.26