Finding the Fourth Proportional to 85,840.72, 128,737.69 and 35,912.73

Step by Step Solution

1. Step 1: Write the proportion equation
   85,840.72 : 128,737.69 = 35,912.73 : x
2. Step 2: Convert to fraction form
   85,840.72/128,737.69 = 35,912.73/x
3. Step 3: Cross multiply
   85,840.72x = 128,737.69 × 35,912.73
4. Step 4: Simplify right side
   85,840.72x = 4,623,321,901.79
5. Step 5: Solve for x
   x = 4,623,321,901.79/85,840.72
6. Step 6: Final answer
   x = 53,859.31