Finding the Fourth Proportional to 12,578.64, 17,353.56 and 8,105.01

Step by Step Solution

1. Step 1: Write the proportion equation
   12,578.64 : 17,353.56 = 8,105.01 : x
2. Step 2: Convert to fraction form
   12,578.64/17,353.56 = 8,105.01/x
3. Step 3: Cross multiply
   12,578.64x = 17,353.56 × 8,105.01
4. Step 4: Simplify right side
   12,578.64x = 140,650,777.34
5. Step 5: Solve for x
   x = 140,650,777.34/12,578.64
6. Step 6: Final answer
   x = 11,181.72