Finding the Fourth Proportional to 12,685.42, 17,504.28 and 7,019.37

Step by Step Solution

1. Step 1: Write the proportion equation
   12,685.42 : 17,504.28 = 7,019.37 : x
2. Step 2: Convert to fraction form
   12,685.42/17,504.28 = 7,019.37/x
3. Step 3: Cross multiply
   12,685.42x = 17,504.28 × 7,019.37
4. Step 4: Simplify right side
   12,685.42x = 122,869,017.90
5. Step 5: Solve for x
   x = 122,869,017.90/12,685.42
6. Step 6: Final answer
   x = 9,685.85