Finding the Fourth Proportional to 23,049.81, 31,806.30 and 12,978.08

Step by Step Solution

1. Step 1: Write the proportion equation
   23,049.81 : 31,806.30 = 12,978.08 : x
2. Step 2: Convert to fraction form
   23,049.81/31,806.30 = 12,978.08/x
3. Step 3: Cross multiply
   23,049.81x = 31,806.30 × 12,978.08
4. Step 4: Simplify right side
   23,049.81x = 412,784,546.87
5. Step 5: Solve for x
   x = 412,784,546.87/23,049.81
6. Step 6: Final answer
   x = 17,908.37