Finding the Fourth Proportional to 8,128.50, 12,192.78 and 1,972.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,128.50 : 12,192.78 = 1,972.50 : x
2. Step 2: Convert to fraction form
   8,128.50/12,192.78 = 1,972.50/x
3. Step 3: Cross multiply
   8,128.50x = 12,192.78 × 1,972.50
4. Step 4: Simplify right side
   8,128.50x = 24,050,258.55
5. Step 5: Solve for x
   x = 24,050,258.55/8,128.50
6. Step 6: Final answer
   x = 2,958.76