Finding the Fourth Proportional to 14,259.43, 21,388.78 and 3,870.91

Step by Step Solution

1. Step 1: Write the proportion equation
   14,259.43 : 21,388.78 = 3,870.91 : x
2. Step 2: Convert to fraction form
   14,259.43/21,388.78 = 3,870.91/x
3. Step 3: Cross multiply
   14,259.43x = 21,388.78 × 3,870.91
4. Step 4: Simplify right side
   14,259.43x = 82,794,042.39
5. Step 5: Solve for x
   x = 82,794,042.39/14,259.43
6. Step 6: Final answer
   x = 5,806.27