Finding the Fourth Proportional to 129,665.79, 194,451.89 and 54,791.72

Step by Step Solution

1. Step 1: Write the proportion equation
   129,665.79 : 194,451.89 = 54,791.72 : x
2. Step 2: Convert to fraction form
   129,665.79/194,451.89 = 54,791.72/x
3. Step 3: Cross multiply
   129,665.79x = 194,451.89 × 54,791.72
4. Step 4: Simplify right side
   129,665.79x = 10,654,352,754.63
5. Step 5: Solve for x
   x = 10,654,352,754.63/129,665.79
6. Step 6: Final answer
   x = 82,167.80