Finding the Fourth Proportional to 143,389.05, 215,112.29 and 80,298.89

Step by Step Solution

1. Step 1: Write the proportion equation
   143,389.05 : 215,112.29 = 80,298.89 : x
2. Step 2: Convert to fraction form
   143,389.05/215,112.29 = 80,298.89/x
3. Step 3: Cross multiply
   143,389.05x = 215,112.29 × 80,298.89
4. Step 4: Simplify right side
   143,389.05x = 17,273,278,248.64
5. Step 5: Solve for x
   x = 17,273,278,248.64/143,389.05
6. Step 6: Final answer
   x = 120,464.42