Finding the Fourth Proportional to 105,595.62, 158,016.20 and 91,719.15

Step by Step Solution

1. Step 1: Write the proportion equation
   105,595.62 : 158,016.20 = 91,719.15 : x
2. Step 2: Convert to fraction form
   105,595.62/158,016.20 = 91,719.15/x
3. Step 3: Cross multiply
   105,595.62x = 158,016.20 × 91,719.15
4. Step 4: Simplify right side
   105,595.62x = 14,493,111,091.63
5. Step 5: Solve for x
   x = 14,493,111,091.63/105,595.62
6. Step 6: Final answer
   x = 137,251.06