Finding the Fourth Proportional to 12,492.28, 17,238.72 and 8,961.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,492.28 : 17,238.72 = 8,961.40 : x
2. Step 2: Convert to fraction form
   12,492.28/17,238.72 = 8,961.40/x
3. Step 3: Cross multiply
   12,492.28x = 17,238.72 × 8,961.40
4. Step 4: Simplify right side
   12,492.28x = 154,483,065.41
5. Step 5: Solve for x
   x = 154,483,065.41/12,492.28
6. Step 6: Final answer
   x = 12,366.28