Finding the Fourth Proportional to 10,128.36, 13,978.92 and 6,547.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,128.36 : 13,978.92 = 6,547.72 : x
2. Step 2: Convert to fraction form
   10,128.36/13,978.92 = 6,547.72/x
3. Step 3: Cross multiply
   10,128.36x = 13,978.92 × 6,547.72
4. Step 4: Simplify right side
   10,128.36x = 91,530,054.06
5. Step 5: Solve for x
   x = 91,530,054.06/10,128.36
6. Step 6: Final answer
   x = 9,037.01