Finding the Fourth Proportional to 13,181.94, 18,188.55 and 7,874.82

Step by Step Solution

1. Step 1: Write the proportion equation
   13,181.94 : 18,188.55 = 7,874.82 : x
2. Step 2: Convert to fraction form
   13,181.94/18,188.55 = 7,874.82/x
3. Step 3: Cross multiply
   13,181.94x = 18,188.55 × 7,874.82
4. Step 4: Simplify right side
   13,181.94x = 143,231,557.31
5. Step 5: Solve for x
   x = 143,231,557.31/13,181.94
6. Step 6: Final answer
   x = 10,865.74