Finding the Fourth Proportional to 10,172.16, 15,227.52 and 9,198.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,172.16 : 15,227.52 = 9,198.72 : x
2. Step 2: Convert to fraction form
   10,172.16/15,227.52 = 9,198.72/x
3. Step 3: Cross multiply
   10,172.16x = 15,227.52 × 9,198.72
4. Step 4: Simplify right side
   10,172.16x = 140,073,692.77
5. Step 5: Solve for x
   x = 140,073,692.77/10,172.16
6. Step 6: Final answer
   x = 13,770.30