Finding the Fourth Proportional to 23,109.12, 31,890.59 and 13,039.69

Step by Step Solution

1. Step 1: Write the proportion equation
   23,109.12 : 31,890.59 = 13,039.69 : x
2. Step 2: Convert to fraction form
   23,109.12/31,890.59 = 13,039.69/x
3. Step 3: Cross multiply
   23,109.12x = 31,890.59 × 13,039.69
4. Step 4: Simplify right side
   23,109.12x = 415,843,342.32
5. Step 5: Solve for x
   x = 415,843,342.32/23,109.12
6. Step 6: Final answer
   x = 17,994.78