Finding the Fourth Proportional to 23,062.79, 31,826.78 and 12,991.37

Step by Step Solution

1. Step 1: Write the proportion equation
   23,062.79 : 31,826.78 = 12,991.37 : x
2. Step 2: Convert to fraction form
   23,062.79/31,826.78 = 12,991.37/x
3. Step 3: Cross multiply
   23,062.79x = 31,826.78 × 12,991.37
4. Step 4: Simplify right side
   23,062.79x = 413,473,250.80
5. Step 5: Solve for x
   x = 413,473,250.80/23,062.79
6. Step 6: Final answer
   x = 17,928.16