Finding the Fourth Proportional to 12,419.05, 17,139.26 and 7,115.57

Step by Step Solution

1. Step 1: Write the proportion equation
   12,419.05 : 17,139.26 = 7,115.57 : x
2. Step 2: Convert to fraction form
   12,419.05/17,139.26 = 7,115.57/x
3. Step 3: Cross multiply
   12,419.05x = 17,139.26 × 7,115.57
4. Step 4: Simplify right side
   12,419.05x = 121,955,604.28
5. Step 5: Solve for x
   x = 121,955,604.28/12,419.05
6. Step 6: Final answer
   x = 9,820.04