Finding the Fourth Proportional to 23,173.06, 31,979.32 and 13,100.90

Step by Step Solution

1. Step 1: Write the proportion equation
   23,173.06 : 31,979.32 = 13,100.90 : x
2. Step 2: Convert to fraction form
   23,173.06/31,979.32 = 13,100.90/x
3. Step 3: Cross multiply
   23,173.06x = 31,979.32 × 13,100.90
4. Step 4: Simplify right side
   23,173.06x = 418,957,873.39
5. Step 5: Solve for x
   x = 418,957,873.39/23,173.06
6. Step 6: Final answer
   x = 18,079.52