Finding the Fourth Proportional to 13,018.29, 17,964.15 and 7,640.15

Step by Step Solution

1. Step 1: Write the proportion equation
   13,018.29 : 17,964.15 = 7,640.15 : x
2. Step 2: Convert to fraction form
   13,018.29/17,964.15 = 7,640.15/x
3. Step 3: Cross multiply
   13,018.29x = 17,964.15 × 7,640.15
4. Step 4: Simplify right side
   13,018.29x = 137,248,797.14
5. Step 5: Solve for x
   x = 137,248,797.14/13,018.29
6. Step 6: Final answer
   x = 10,542.77