Finding the Fourth Proportional to 12,474.12, 17,217.24 and 7,172.01

Step by Step Solution

1. Step 1: Write the proportion equation
   12,474.12 : 17,217.24 = 7,172.01 : x
2. Step 2: Convert to fraction form
   12,474.12/17,217.24 = 7,172.01/x
3. Step 3: Cross multiply
   12,474.12x = 17,217.24 × 7,172.01
4. Step 4: Simplify right side
   12,474.12x = 123,482,217.45
5. Step 5: Solve for x
   x = 123,482,217.45/12,474.12
6. Step 6: Final answer
   x = 9,899.07