Finding the Fourth Proportional to 12,401.72, 17,107.55 and 7,856.07

Step by Step Solution

1. Step 1: Write the proportion equation
   12,401.72 : 17,107.55 = 7,856.07 : x
2. Step 2: Convert to fraction form
   12,401.72/17,107.55 = 7,856.07/x
3. Step 3: Cross multiply
   12,401.72x = 17,107.55 × 7,856.07
4. Step 4: Simplify right side
   12,401.72x = 134,398,071.05
5. Step 5: Solve for x
   x = 134,398,071.05/12,401.72
6. Step 6: Final answer
   x = 10,837.06