Finding the Fourth Proportional to 12,401.76, 17,107.61 and 7,856.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,401.76 : 17,107.61 = 7,856.12 : x
2. Step 2: Convert to fraction form
   12,401.76/17,107.61 = 7,856.12/x
3. Step 3: Cross multiply
   12,401.76x = 17,107.61 × 7,856.12
4. Step 4: Simplify right side
   12,401.76x = 134,399,410.62
5. Step 5: Solve for x
   x = 134,399,410.62/12,401.76
6. Step 6: Final answer
   x = 10,837.12