Finding the Fourth Proportional to 105,819.36, 158,645.82 and 72,438.24

Step by Step Solution

1. Step 1: Write the proportion equation
   105,819.36 : 158,645.82 = 72,438.24 : x
2. Step 2: Convert to fraction form
   105,819.36/158,645.82 = 72,438.24/x
3. Step 3: Cross multiply
   105,819.36x = 158,645.82 × 72,438.24
4. Step 4: Simplify right side
   105,819.36x = 11,492,023,984.16
5. Step 5: Solve for x
   x = 11,492,023,984.16/105,819.36
6. Step 6: Final answer
   x = 108,600.39