Finding the Fourth Proportional to 143,390.72, 215,114.81 and 80,300.58

Step by Step Solution

1. Step 1: Write the proportion equation
   143,390.72 : 215,114.81 = 80,300.58 : x
2. Step 2: Convert to fraction form
   143,390.72/215,114.81 = 80,300.58/x
3. Step 3: Cross multiply
   143,390.72x = 215,114.81 × 80,300.58
4. Step 4: Simplify right side
   143,390.72x = 17,273,843,608.09
5. Step 5: Solve for x
   x = 17,273,843,608.09/143,390.72
6. Step 6: Final answer
   x = 120,466.96