Finding the Fourth Proportional to 14,245.89, 21,361.28 and 7,129.01

Step by Step Solution

1. Step 1: Write the proportion equation
   14,245.89 : 21,361.28 = 7,129.01 : x
2. Step 2: Convert to fraction form
   14,245.89/21,361.28 = 7,129.01/x
3. Step 3: Cross multiply
   14,245.89x = 21,361.28 × 7,129.01
4. Step 4: Simplify right side
   14,245.89x = 152,284,636.28
5. Step 5: Solve for x
   x = 152,284,636.28/14,245.89
6. Step 6: Final answer
   x = 10,689.72