Finding the Fourth Proportional to 10,856.17, 14,965.18 and 8,494.21

Step by Step Solution

1. Step 1: Write the proportion equation
   10,856.17 : 14,965.18 = 8,494.21 : x
2. Step 2: Convert to fraction form
   10,856.17/14,965.18 = 8,494.21/x
3. Step 3: Cross multiply
   10,856.17x = 14,965.18 × 8,494.21
4. Step 4: Simplify right side
   10,856.17x = 127,117,381.61
5. Step 5: Solve for x
   x = 127,117,381.61/10,856.17
6. Step 6: Final answer
   x = 11,709.23