Finding the Fourth Proportional to 105,580.28, 158,528.56 and 91,392.80

Step by Step Solution

1. Step 1: Write the proportion equation
   105,580.28 : 158,528.56 = 91,392.80 : x
2. Step 2: Convert to fraction form
   105,580.28/158,528.56 = 91,392.80/x
3. Step 3: Cross multiply
   105,580.28x = 158,528.56 × 91,392.80
4. Step 4: Simplify right side
   105,580.28x = 14,488,368,978.37
5. Step 5: Solve for x
   x = 14,488,368,978.37/105,580.28
6. Step 6: Final answer
   x = 137,226.09