Finding the Fourth Proportional to 11,148.72, 16,730.16 and 4,128

Step by Step Solution

1. Step 1: Write the proportion equation
   11,148.72 : 16,730.16 = 4,128 : x
2. Step 2: Convert to fraction form
   11,148.72/16,730.16 = 4,128/x
3. Step 3: Cross multiply
   11,148.72x = 16,730.16 × 4,128
4. Step 4: Simplify right side
   11,148.72x = 69,062,100.48
5. Step 5: Solve for x
   x = 69,062,100.48/11,148.72
6. Step 6: Final answer
   x = 6,194.62