Finding the Fourth Proportional to 14,257.56, 21,387.42 and 3,870.12

Step by Step Solution

1. Step 1: Write the proportion equation
   14,257.56 : 21,387.42 = 3,870.12 : x
2. Step 2: Convert to fraction form
   14,257.56/21,387.42 = 3,870.12/x
3. Step 3: Cross multiply
   14,257.56x = 21,387.42 × 3,870.12
4. Step 4: Simplify right side
   14,257.56x = 82,771,881.89
5. Step 5: Solve for x
   x = 82,771,881.89/14,257.56
6. Step 6: Final answer
   x = 5,805.47