Finding the Fourth Proportional to 12,434.76, 17,161.61 and 7,128.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,434.76 : 17,161.61 = 7,128.56 : x
2. Step 2: Convert to fraction form
   12,434.76/17,161.61 = 7,128.56/x
3. Step 3: Cross multiply
   12,434.76x = 17,161.61 × 7,128.56
4. Step 4: Simplify right side
   12,434.76x = 122,337,498.59
5. Step 5: Solve for x
   x = 122,337,498.59/12,434.76
6. Step 6: Final answer
   x = 9,838.35