Finding the Fourth Proportional to 68,456.72, 102,688.72 and 21,713.24

Step by Step Solution

1. Step 1: Write the proportion equation
   68,456.72 : 102,688.72 = 21,713.24 : x
2. Step 2: Convert to fraction form
   68,456.72/102,688.72 = 21,713.24/x
3. Step 3: Cross multiply
   68,456.72x = 102,688.72 × 21,713.24
4. Step 4: Simplify right side
   68,456.72x = 2,229,704,822.65
5. Step 5: Solve for x
   x = 2,229,704,822.65/68,456.72
6. Step 6: Final answer
   x = 32,571.01