Finding the Fourth Proportional to 105,609.48, 158,036.72 and 91,733

Step by Step Solution

1. Step 1: Write the proportion equation
   105,609.48 : 158,036.72 = 91,733 : x
2. Step 2: Convert to fraction form
   105,609.48/158,036.72 = 91,733/x
3. Step 3: Cross multiply
   105,609.48x = 158,036.72 × 91,733
4. Step 4: Simplify right side
   105,609.48x = 14,497,182,435.76
5. Step 5: Solve for x
   x = 14,497,182,435.76/105,609.48
6. Step 6: Final answer
   x = 137,271.60