Finding the Fourth Proportional to 23,638.47, 32,619.58 and 13,028.28

Step by Step Solution

1. Step 1: Write the proportion equation
   23,638.47 : 32,619.58 = 13,028.28 : x
2. Step 2: Convert to fraction form
   23,638.47/32,619.58 = 13,028.28/x
3. Step 3: Cross multiply
   23,638.47x = 32,619.58 × 13,028.28
4. Step 4: Simplify right side
   23,638.47x = 424,977,021.72
5. Step 5: Solve for x
   x = 424,977,021.72/23,638.47
6. Step 6: Final answer
   x = 17,978.19