Finding the Fourth Proportional to 22,915.50, 31,622.70 and 13,357.50

Step by Step Solution

1. Step 1: Write the proportion equation
   22,915.50 : 31,622.70 = 13,357.50 : x
2. Step 2: Convert to fraction form
   22,915.50/31,622.70 = 13,357.50/x
3. Step 3: Cross multiply
   22,915.50x = 31,622.70 × 13,357.50
4. Step 4: Simplify right side
   22,915.50x = 422,400,215.25
5. Step 5: Solve for x
   x = 422,400,215.25/22,915.50
6. Step 6: Final answer
   x = 18,432.95