Finding the Fourth Proportional to 14,279.97, 21,419.34 and 3,891.72

Step by Step Solution

1. Step 1: Write the proportion equation
   14,279.97 : 21,419.34 = 3,891.72 : x
2. Step 2: Convert to fraction form
   14,279.97/21,419.34 = 3,891.72/x
3. Step 3: Cross multiply
   14,279.97x = 21,419.34 × 3,891.72
4. Step 4: Simplify right side
   14,279.97x = 83,358,073.86
5. Step 5: Solve for x
   x = 83,358,073.86/14,279.97
6. Step 6: Final answer
   x = 5,837.41