Finding the Fourth Proportional to 137,727.72, 190,143.24 and 105,206.28

Step by Step Solution

1. Step 1: Write the proportion equation
   137,727.72 : 190,143.24 = 105,206.28 : x
2. Step 2: Convert to fraction form
   137,727.72/190,143.24 = 105,206.28/x
3. Step 3: Cross multiply
   137,727.72x = 190,143.24 × 105,206.28
4. Step 4: Simplify right side
   137,727.72x = 20,004,262,947.55
5. Step 5: Solve for x
   x = 20,004,262,947.55/137,727.72
6. Step 6: Final answer
   x = 145,245.00