Finding the Fourth Proportional to 14,141.05, 21,213.78 and 4,279.30

Step by Step Solution

1. Step 1: Write the proportion equation
   14,141.05 : 21,213.78 = 4,279.30 : x
2. Step 2: Convert to fraction form
   14,141.05/21,213.78 = 4,279.30/x
3. Step 3: Cross multiply
   14,141.05x = 21,213.78 × 4,279.30
4. Step 4: Simplify right side
   14,141.05x = 90,780,128.75
5. Step 5: Solve for x
   x = 90,780,128.75/14,141.05
6. Step 6: Final answer
   x = 6,419.62