Finding the Fourth Proportional to 12,590.37, 18,881.69 and 4,155.32

Step by Step Solution

1. Step 1: Write the proportion equation
   12,590.37 : 18,881.69 = 4,155.32 : x
2. Step 2: Convert to fraction form
   12,590.37/18,881.69 = 4,155.32/x
3. Step 3: Cross multiply
   12,590.37x = 18,881.69 × 4,155.32
4. Step 4: Simplify right side
   12,590.37x = 78,459,464.09
5. Step 5: Solve for x
   x = 78,459,464.09/12,590.37
6. Step 6: Final answer
   x = 6,231.70