Finding the Fourth Proportional to 13,057.89, 18,019.61 and 7,089.51

Step by Step Solution

1. Step 1: Write the proportion equation
   13,057.89 : 18,019.61 = 7,089.51 : x
2. Step 2: Convert to fraction form
   13,057.89/18,019.61 = 7,089.51/x
3. Step 3: Cross multiply
   13,057.89x = 18,019.61 × 7,089.51
4. Step 4: Simplify right side
   13,057.89x = 127,750,205.29
5. Step 5: Solve for x
   x = 127,750,205.29/13,057.89
6. Step 6: Final answer
   x = 9,783.37