Finding the Fourth Proportional to 105,819.92, 158,728.10 and 42,638.52

Step by Step Solution

1. Step 1: Write the proportion equation
   105,819.92 : 158,728.10 = 42,638.52 : x
2. Step 2: Convert to fraction form
   105,819.92/158,728.10 = 42,638.52/x
3. Step 3: Cross multiply
   105,819.92x = 158,728.10 × 42,638.52
4. Step 4: Simplify right side
   105,819.92x = 6,767,931,266.41
5. Step 5: Solve for x
   x = 6,767,931,266.41/105,819.92
6. Step 6: Final answer
   x = 63,957.06