Finding the Fourth Proportional to 23,900.86, 32,979.37 and 13,290.57

Step by Step Solution

1. Step 1: Write the proportion equation
   23,900.86 : 32,979.37 = 13,290.57 : x
2. Step 2: Convert to fraction form
   23,900.86/32,979.37 = 13,290.57/x
3. Step 3: Cross multiply
   23,900.86x = 32,979.37 × 13,290.57
4. Step 4: Simplify right side
   23,900.86x = 438,314,625.54
5. Step 5: Solve for x
   x = 438,314,625.54/23,900.86
6. Step 6: Final answer
   x = 18,338.86