Finding the Fourth Proportional to 143,123.28, 214,665.48 and 54,399.12

Step by Step Solution

1. Step 1: Write the proportion equation
   143,123.28 : 214,665.48 = 54,399.12 : x
2. Step 2: Convert to fraction form
   143,123.28/214,665.48 = 54,399.12/x
3. Step 3: Cross multiply
   143,123.28x = 214,665.48 × 54,399.12
4. Step 4: Simplify right side
   143,123.28x = 11,677,613,206.38
5. Step 5: Solve for x
   x = 11,677,613,206.38/143,123.28
6. Step 6: Final answer
   x = 81,591.29