Finding the Fourth Proportional to 13,019.40, 17,963.64 and 7,715.52

Step by Step Solution

1. Step 1: Write the proportion equation
   13,019.40 : 17,963.64 = 7,715.52 : x
2. Step 2: Convert to fraction form
   13,019.40/17,963.64 = 7,715.52/x
3. Step 3: Cross multiply
   13,019.40x = 17,963.64 × 7,715.52
4. Step 4: Simplify right side
   13,019.40x = 138,598,823.69
5. Step 5: Solve for x
   x = 138,598,823.69/13,019.40
6. Step 6: Final answer
   x = 10,645.56