Finding the Fourth Proportional to 105,859.01, 158,667.71 and 42,638.64

Step by Step Solution

1. Step 1: Write the proportion equation
   105,859.01 : 158,667.71 = 42,638.64 : x
2. Step 2: Convert to fraction form
   105,859.01/158,667.71 = 42,638.64/x
3. Step 3: Cross multiply
   105,859.01x = 158,667.71 × 42,638.64
4. Step 4: Simplify right side
   105,859.01x = 6,765,375,153.12
5. Step 5: Solve for x
   x = 6,765,375,153.12/105,859.01
6. Step 6: Final answer
   x = 63,909.30