Finding the Fourth Proportional to 13,017.30, 17,962.78 and 7,639.18

Step by Step Solution

1. Step 1: Write the proportion equation
   13,017.30 : 17,962.78 = 7,639.18 : x
2. Step 2: Convert to fraction form
   13,017.30/17,962.78 = 7,639.18/x
3. Step 3: Cross multiply
   13,017.30x = 17,962.78 × 7,639.18
4. Step 4: Simplify right side
   13,017.30x = 137,220,909.72
5. Step 5: Solve for x
   x = 137,220,909.72/13,017.30
6. Step 6: Final answer
   x = 10,541.43