Finding the Fourth Proportional to 105,819.79, 158,727.94 and 42,638.37

Step by Step Solution

1. Step 1: Write the proportion equation
   105,819.79 : 158,727.94 = 42,638.37 : x
2. Step 2: Convert to fraction form
   105,819.79/158,727.94 = 42,638.37/x
3. Step 3: Cross multiply
   105,819.79x = 158,727.94 × 42,638.37
4. Step 4: Simplify right side
   105,819.79x = 6,767,900,528.46
5. Step 5: Solve for x
   x = 6,767,900,528.46/105,819.79
6. Step 6: Final answer
   x = 63,956.85