Finding the Fourth Proportional to 13,057.89, 18,019.38 and 7,089.42

Step by Step Solution

1. Step 1: Write the proportion equation
   13,057.89 : 18,019.38 = 7,089.42 : x
2. Step 2: Convert to fraction form
   13,057.89/18,019.38 = 7,089.42/x
3. Step 3: Cross multiply
   13,057.89x = 18,019.38 × 7,089.42
4. Step 4: Simplify right side
   13,057.89x = 127,746,952.96
5. Step 5: Solve for x
   x = 127,746,952.96/13,057.89
6. Step 6: Final answer
   x = 9,783.12