Finding the Fourth Proportional to 85,438.54, 128,084.83 and 60,399.82

Step by Step Solution

1. Step 1: Write the proportion equation
   85,438.54 : 128,084.83 = 60,399.82 : x
2. Step 2: Convert to fraction form
   85,438.54/128,084.83 = 60,399.82/x
3. Step 3: Cross multiply
   85,438.54x = 128,084.83 × 60,399.82
4. Step 4: Simplify right side
   85,438.54x = 7,736,300,676.73
5. Step 5: Solve for x
   x = 7,736,300,676.73/85,438.54
6. Step 6: Final answer
   x = 90,548.14