Finding the Fourth Proportional to 22,428.78, 30,951.06 and 12,870.26

Step by Step Solution

1. Step 1: Write the proportion equation
   22,428.78 : 30,951.06 = 12,870.26 : x
2. Step 2: Convert to fraction form
   22,428.78/30,951.06 = 12,870.26/x
3. Step 3: Cross multiply
   22,428.78x = 30,951.06 × 12,870.26
4. Step 4: Simplify right side
   22,428.78x = 398,348,189.48
5. Step 5: Solve for x
   x = 398,348,189.48/22,428.78
6. Step 6: Final answer
   x = 17,760.58