Finding the Fourth Proportional to 8,100.28, 12,128.55 and 5,472.01

Step by Step Solution

1. Step 1: Write the proportion equation
   8,100.28 : 12,128.55 = 5,472.01 : x
2. Step 2: Convert to fraction form
   8,100.28/12,128.55 = 5,472.01/x
3. Step 3: Cross multiply
   8,100.28x = 12,128.55 × 5,472.01
4. Step 4: Simplify right side
   8,100.28x = 66,367,546.89
5. Step 5: Solve for x
   x = 66,367,546.89/8,100.28
6. Step 6: Final answer
   x = 8,193.24