Finding the Fourth Proportional to 105,809.91, 158,720.06 and 42,621.50

Step by Step Solution

1. Step 1: Write the proportion equation
   105,809.91 : 158,720.06 = 42,621.50 : x
2. Step 2: Convert to fraction form
   105,809.91/158,720.06 = 42,621.50/x
3. Step 3: Cross multiply
   105,809.91x = 158,720.06 × 42,621.50
4. Step 4: Simplify right side
   105,809.91x = 6,764,886,030.58
5. Step 5: Solve for x
   x = 6,764,886,030.58/105,809.91
6. Step 6: Final answer
   x = 63,934.33