Finding the Fourth Proportional to 23,131.20, 31,921.17 and 13,060.05

Step by Step Solution

1. Step 1: Write the proportion equation
   23,131.20 : 31,921.17 = 13,060.05 : x
2. Step 2: Convert to fraction form
   23,131.20/31,921.17 = 13,060.05/x
3. Step 3: Cross multiply
   23,131.20x = 31,921.17 × 13,060.05
4. Step 4: Simplify right side
   23,131.20x = 416,892,076.26
5. Step 5: Solve for x
   x = 416,892,076.26/23,131.20
6. Step 6: Final answer
   x = 18,022.93