Finding the Fourth Proportional to 12,685.29, 17,505.34 and 7,020.27

Step by Step Solution

1. Step 1: Write the proportion equation
   12,685.29 : 17,505.34 = 7,020.27 : x
2. Step 2: Convert to fraction form
   12,685.29/17,505.34 = 7,020.27/x
3. Step 3: Cross multiply
   12,685.29x = 17,505.34 × 7,020.27
4. Step 4: Simplify right side
   12,685.29x = 122,892,287.66
5. Step 5: Solve for x
   x = 122,892,287.66/12,685.29
6. Step 6: Final answer
   x = 9,687.78