Finding the Fourth Proportional to 12,433.84, 17,166 and 7,720.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,433.84 : 17,166 = 7,720.72 : x
2. Step 2: Convert to fraction form
   12,433.84/17,166 = 7,720.72/x
3. Step 3: Cross multiply
   12,433.84x = 17,166 × 7,720.72
4. Step 4: Simplify right side
   12,433.84x = 132,533,879.52
5. Step 5: Solve for x
   x = 132,533,879.52/12,433.84
6. Step 6: Final answer
   x = 10,659.13