Finding the Fourth Proportional to 105,978.23, 159,102.23 and 68,694.32

Step by Step Solution

1. Step 1: Write the proportion equation
   105,978.23 : 159,102.23 = 68,694.32 : x
2. Step 2: Convert to fraction form
   105,978.23/159,102.23 = 68,694.32/x
3. Step 3: Cross multiply
   105,978.23x = 159,102.23 × 68,694.32
4. Step 4: Simplify right side
   105,978.23x = 10,929,419,500.33
5. Step 5: Solve for x
   x = 10,929,419,500.33/105,978.23
6. Step 6: Final answer
   x = 103,128.91