Finding the Fourth Proportional to 12,401.70, 17,106.69 and 10,136.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,401.70 : 17,106.69 = 10,136.40 : x
2. Step 2: Convert to fraction form
   12,401.70/17,106.69 = 10,136.40/x
3. Step 3: Cross multiply
   12,401.70x = 17,106.69 × 10,136.40
4. Step 4: Simplify right side
   12,401.70x = 173,400,252.52
5. Step 5: Solve for x
   x = 173,400,252.52/12,401.70
6. Step 6: Final answer
   x = 13,981.97