Finding the Fourth Proportional to 23,051.49, 31,810.69 and 12,979.90

Step by Step Solution

1. Step 1: Write the proportion equation
   23,051.49 : 31,810.69 = 12,979.90 : x
2. Step 2: Convert to fraction form
   23,051.49/31,810.69 = 12,979.90/x
3. Step 3: Cross multiply
   23,051.49x = 31,810.69 × 12,979.90
4. Step 4: Simplify right side
   23,051.49x = 412,899,452.18
5. Step 5: Solve for x
   x = 412,899,452.18/23,051.49
6. Step 6: Final answer
   x = 17,912.05