Finding the Fourth Proportional to 22,360.88, 30,858.55 and 12,290.28

Step by Step Solution

1. Step 1: Write the proportion equation
   22,360.88 : 30,858.55 = 12,290.28 : x
2. Step 2: Convert to fraction form
   22,360.88/30,858.55 = 12,290.28/x
3. Step 3: Cross multiply
   22,360.88x = 30,858.55 × 12,290.28
4. Step 4: Simplify right side
   22,360.88x = 379,260,219.89
5. Step 5: Solve for x
   x = 379,260,219.89/22,360.88
6. Step 6: Final answer
   x = 16,960.88