Finding the Fourth Proportional to 10,997.72, 15,172.88 and 7,222.93

Step by Step Solution

1. Step 1: Write the proportion equation
   10,997.72 : 15,172.88 = 7,222.93 : x
2. Step 2: Convert to fraction form
   10,997.72/15,172.88 = 7,222.93/x
3. Step 3: Cross multiply
   10,997.72x = 15,172.88 × 7,222.93
4. Step 4: Simplify right side
   10,997.72x = 109,592,733.56
5. Step 5: Solve for x
   x = 109,592,733.56/10,997.72
6. Step 6: Final answer
   x = 9,965.04