Finding the Fourth Proportional to 23,062.76, 31,822.38 and 12,989.05

Step by Step Solution

1. Step 1: Write the proportion equation
   23,062.76 : 31,822.38 = 12,989.05 : x
2. Step 2: Convert to fraction form
   23,062.76/31,822.38 = 12,989.05/x
3. Step 3: Cross multiply
   23,062.76x = 31,822.38 × 12,989.05
4. Step 4: Simplify right side
   23,062.76x = 413,342,454.09
5. Step 5: Solve for x
   x = 413,342,454.09/23,062.76
6. Step 6: Final answer
   x = 17,922.50