Finding the Fourth Proportional to 6,400.80, 8,828.78 and 4,275.50

Step by Step Solution

1. Step 1: Write the proportion equation
   6,400.80 : 8,828.78 = 4,275.50 : x
2. Step 2: Convert to fraction form
   6,400.80/8,828.78 = 4,275.50/x
3. Step 3: Cross multiply
   6,400.80x = 8,828.78 × 4,275.50
4. Step 4: Simplify right side
   6,400.80x = 37,747,383.37
5. Step 5: Solve for x
   x = 37,747,383.37/6,400.80
6. Step 6: Final answer
   x = 5,897.29