Finding the Fourth Proportional to 143,406.72, 215,105.22 and 54,657

Step by Step Solution

1. Step 1: Write the proportion equation
   143,406.72 : 215,105.22 = 54,657 : x
2. Step 2: Convert to fraction form
   143,406.72/215,105.22 = 54,657/x
3. Step 3: Cross multiply
   143,406.72x = 215,105.22 × 54,657
4. Step 4: Simplify right side
   143,406.72x = 11,757,006,009.54
5. Step 5: Solve for x
   x = 11,757,006,009.54/143,406.72
6. Step 6: Final answer
   x = 81,983.65