Finding the Fourth Proportional to 10,356.20, 14,291.72 and 5,640.48

Step by Step Solution

1. Step 1: Write the proportion equation
   10,356.20 : 14,291.72 = 5,640.48 : x
2. Step 2: Convert to fraction form
   10,356.20/14,291.72 = 5,640.48/x
3. Step 3: Cross multiply
   10,356.20x = 14,291.72 × 5,640.48
4. Step 4: Simplify right side
   10,356.20x = 80,612,107.47
5. Step 5: Solve for x
   x = 80,612,107.47/10,356.20
6. Step 6: Final answer
   x = 7,783.95