Finding the Fourth Proportional to 12,475.65, 17,219.87 and 7,172.17

Step by Step Solution

1. Step 1: Write the proportion equation
   12,475.65 : 17,219.87 = 7,172.17 : x
2. Step 2: Convert to fraction form
   12,475.65/17,219.87 = 7,172.17/x
3. Step 3: Cross multiply
   12,475.65x = 17,219.87 × 7,172.17
4. Step 4: Simplify right side
   12,475.65x = 123,503,799.16
5. Step 5: Solve for x
   x = 123,503,799.16/12,475.65
6. Step 6: Final answer
   x = 9,899.59