Finding the Fourth Proportional to 10,356.50, 14,292 and 5,640.79

Step by Step Solution

1. Step 1: Write the proportion equation
   10,356.50 : 14,292 = 5,640.79 : x
2. Step 2: Convert to fraction form
   10,356.50/14,292 = 5,640.79/x
3. Step 3: Cross multiply
   10,356.50x = 14,292 × 5,640.79
4. Step 4: Simplify right side
   10,356.50x = 80,618,099.22
5. Step 5: Solve for x
   x = 80,618,099.22/10,356.50
6. Step 6: Final answer
   x = 7,784.30