Finding the Fourth Proportional to 12,837.89, 17,716.31 and 7,172.65

Step by Step Solution

1. Step 1: Write the proportion equation
   12,837.89 : 17,716.31 = 7,172.65 : x
2. Step 2: Convert to fraction form
   12,837.89/17,716.31 = 7,172.65/x
3. Step 3: Cross multiply
   12,837.89x = 17,716.31 × 7,172.65
4. Step 4: Simplify right side
   12,837.89x = 127,072,846.63
5. Step 5: Solve for x
   x = 127,072,846.63/12,837.89
6. Step 6: Final answer
   x = 9,898.27