Finding the Fourth Proportional to 13,057.54, 18,019.35 and 7,089.20

Step by Step Solution

1. Step 1: Write the proportion equation
   13,057.54 : 18,019.35 = 7,089.20 : x
2. Step 2: Convert to fraction form
   13,057.54/18,019.35 = 7,089.20/x
3. Step 3: Cross multiply
   13,057.54x = 18,019.35 × 7,089.20
4. Step 4: Simplify right side
   13,057.54x = 127,742,844.89
5. Step 5: Solve for x
   x = 127,742,844.89/13,057.54
6. Step 6: Final answer
   x = 9,783.07