Finding the Fourth Proportional to 12,111.91, 18,154.80 and 5,858.71

Step by Step Solution

1. Step 1: Write the proportion equation
   12,111.91 : 18,154.80 = 5,858.71 : x
2. Step 2: Convert to fraction form
   12,111.91/18,154.80 = 5,858.71/x
3. Step 3: Cross multiply
   12,111.91x = 18,154.80 × 5,858.71
4. Step 4: Simplify right side
   12,111.91x = 106,363,662.92
5. Step 5: Solve for x
   x = 106,363,662.92/12,111.91
6. Step 6: Final answer
   x = 8,781.74