Finding the Fourth Proportional to 105,615.72, 158,443.56 and 42,440.76

Step by Step Solution

1. Step 1: Write the proportion equation
   105,615.72 : 158,443.56 = 42,440.76 : x
2. Step 2: Convert to fraction form
   105,615.72/158,443.56 = 42,440.76/x
3. Step 3: Cross multiply
   105,615.72x = 158,443.56 × 42,440.76
4. Step 4: Simplify right side
   105,615.72x = 6,724,465,103.51
5. Step 5: Solve for x
   x = 6,724,465,103.51/105,615.72
6. Step 6: Final answer
   x = 63,669.17