Finding the Fourth Proportional to 22,978.34, 31,707.87 and 12,904.49

Step by Step Solution

1. Step 1: Write the proportion equation
   22,978.34 : 31,707.87 = 12,904.49 : x
2. Step 2: Convert to fraction form
   22,978.34/31,707.87 = 12,904.49/x
3. Step 3: Cross multiply
   22,978.34x = 31,707.87 × 12,904.49
4. Step 4: Simplify right side
   22,978.34x = 409,173,891.34
5. Step 5: Solve for x
   x = 409,173,891.34/22,978.34
6. Step 6: Final answer
   x = 17,806.94