Finding the Fourth Proportional to 15,738.72, 21,720.72 and 9,450.96

Step by Step Solution

1. Step 1: Write the proportion equation
   15,738.72 : 21,720.72 = 9,450.96 : x
2. Step 2: Convert to fraction form
   15,738.72/21,720.72 = 9,450.96/x
3. Step 3: Cross multiply
   15,738.72x = 21,720.72 × 9,450.96
4. Step 4: Simplify right side
   15,738.72x = 205,281,655.89
5. Step 5: Solve for x
   x = 205,281,655.89/15,738.72
6. Step 6: Final answer
   x = 13,043.10