Finding the Fourth Proportional to 105,789.29, 158,304.78 and 91,606.60

Step by Step Solution

1. Step 1: Write the proportion equation
   105,789.29 : 158,304.78 = 91,606.60 : x
2. Step 2: Convert to fraction form
   105,789.29/158,304.78 = 91,606.60/x
3. Step 3: Cross multiply
   105,789.29x = 158,304.78 × 91,606.60
4. Step 4: Simplify right side
   105,789.29x = 14,501,761,966.96
5. Step 5: Solve for x
   x = 14,501,761,966.96/105,789.29
6. Step 6: Final answer
   x = 137,081.57