Finding the Fourth Proportional to 128,729.50, 193,094.52 and 54,857.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,729.50 : 193,094.52 = 54,857.50 : x
2. Step 2: Convert to fraction form
   128,729.50/193,094.52 = 54,857.50/x
3. Step 3: Cross multiply
   128,729.50x = 193,094.52 × 54,857.50
4. Step 4: Simplify right side
   128,729.50x = 10,592,682,630.90
5. Step 5: Solve for x
   x = 10,592,682,630.90/128,729.50
6. Step 6: Final answer
   x = 82,286.37