Finding the Fourth Proportional to 12,706.11, 19,061.69 and 3,940.70

Step by Step Solution

1. Step 1: Write the proportion equation
   12,706.11 : 19,061.69 = 3,940.70 : x
2. Step 2: Convert to fraction form
   12,706.11/19,061.69 = 3,940.70/x
3. Step 3: Cross multiply
   12,706.11x = 19,061.69 × 3,940.70
4. Step 4: Simplify right side
   12,706.11x = 75,116,286.77
5. Step 5: Solve for x
   x = 75,116,286.77/12,706.11
6. Step 6: Final answer
   x = 5,911.82