Finding the Fourth Proportional to 10,356.16, 14,291.54 and 5,640.43

Step by Step Solution

1. Step 1: Write the proportion equation
   10,356.16 : 14,291.54 = 5,640.43 : x
2. Step 2: Convert to fraction form
   10,356.16/14,291.54 = 5,640.43/x
3. Step 3: Cross multiply
   10,356.16x = 14,291.54 × 5,640.43
4. Step 4: Simplify right side
   10,356.16x = 80,610,430.96
5. Step 5: Solve for x
   x = 80,610,430.96/10,356.16
6. Step 6: Final answer
   x = 7,783.81