Finding the Fourth Proportional to 12,685.47, 17,505.52 and 7,020.46

Step by Step Solution

1. Step 1: Write the proportion equation
   12,685.47 : 17,505.52 = 7,020.46 : x
2. Step 2: Convert to fraction form
   12,685.47/17,505.52 = 7,020.46/x
3. Step 3: Cross multiply
   12,685.47x = 17,505.52 × 7,020.46
4. Step 4: Simplify right side
   12,685.47x = 122,896,741.62
5. Step 5: Solve for x
   x = 122,896,741.62/12,685.47
6. Step 6: Final answer
   x = 9,687.99