Finding the Fourth Proportional to 12,470.85, 17,211.60 and 7,691.58

Step by Step Solution

1. Step 1: Write the proportion equation
   12,470.85 : 17,211.60 = 7,691.58 : x
2. Step 2: Convert to fraction form
   12,470.85/17,211.60 = 7,691.58/x
3. Step 3: Cross multiply
   12,470.85x = 17,211.60 × 7,691.58
4. Step 4: Simplify right side
   12,470.85x = 132,384,398.33
5. Step 5: Solve for x
   x = 132,384,398.33/12,470.85
6. Step 6: Final answer
   x = 10,615.51