Finding the Fourth Proportional to 9,405.51, 12,976.17 and 5,628.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,405.51 : 12,976.17 = 5,628.78 : x
2. Step 2: Convert to fraction form
   9,405.51/12,976.17 = 5,628.78/x
3. Step 3: Cross multiply
   9,405.51x = 12,976.17 × 5,628.78
4. Step 4: Simplify right side
   9,405.51x = 73,039,985.06
5. Step 5: Solve for x
   x = 73,039,985.06/9,405.51
6. Step 6: Final answer
   x = 7,765.66