Finding the Fourth Proportional to 23,128.80, 34,637.28 and 13,238.10

Step by Step Solution

1. Step 1: Write the proportion equation
   23,128.80 : 34,637.28 = 13,238.10 : x
2. Step 2: Convert to fraction form
   23,128.80/34,637.28 = 13,238.10/x
3. Step 3: Cross multiply
   23,128.80x = 34,637.28 × 13,238.10
4. Step 4: Simplify right side
   23,128.80x = 458,531,776.37
5. Step 5: Solve for x
   x = 458,531,776.37/23,128.80
6. Step 6: Final answer
   x = 19,825.14