Finding the Fourth Proportional to 12,476.17, 17,218.20 and 7,172.83

Step by Step Solution

1. Step 1: Write the proportion equation
   12,476.17 : 17,218.20 = 7,172.83 : x
2. Step 2: Convert to fraction form
   12,476.17/17,218.20 = 7,172.83/x
3. Step 3: Cross multiply
   12,476.17x = 17,218.20 × 7,172.83
4. Step 4: Simplify right side
   12,476.17x = 123,503,221.51
5. Step 5: Solve for x
   x = 123,503,221.51/12,476.17
6. Step 6: Final answer
   x = 9,899.13