Finding the Fourth Proportional to 14,128.72, 21,196.49 and 4,267.40

Step by Step Solution

1. Step 1: Write the proportion equation
   14,128.72 : 21,196.49 = 4,267.40 : x
2. Step 2: Convert to fraction form
   14,128.72/21,196.49 = 4,267.40/x
3. Step 3: Cross multiply
   14,128.72x = 21,196.49 × 4,267.40
4. Step 4: Simplify right side
   14,128.72x = 90,453,901.43
5. Step 5: Solve for x
   x = 90,453,901.43/14,128.72
6. Step 6: Final answer
   x = 6,402.13