Finding the Fourth Proportional to 105,709.32, 158,479.20 and 72,345.96

Step by Step Solution

1. Step 1: Write the proportion equation
   105,709.32 : 158,479.20 = 72,345.96 : x
2. Step 2: Convert to fraction form
   105,709.32/158,479.20 = 72,345.96/x
3. Step 3: Cross multiply
   105,709.32x = 158,479.20 × 72,345.96
4. Step 4: Simplify right side
   105,709.32x = 11,465,329,864.03
5. Step 5: Solve for x
   x = 11,465,329,864.03/105,709.32
6. Step 6: Final answer
   x = 108,460.92