Finding the Fourth Proportional to 12,200.71, 18,292.79 and 3,878.23

Step by Step Solution

1. Step 1: Write the proportion equation
   12,200.71 : 18,292.79 = 3,878.23 : x
2. Step 2: Convert to fraction form
   12,200.71/18,292.79 = 3,878.23/x
3. Step 3: Cross multiply
   12,200.71x = 18,292.79 × 3,878.23
4. Step 4: Simplify right side
   12,200.71x = 70,943,627.57
5. Step 5: Solve for x
   x = 70,943,627.57/12,200.71
6. Step 6: Final answer
   x = 5,814.71