Finding the Fourth Proportional to 115,858.72, 159,871.82 and 64,864.36

Step by Step Solution

1. Step 1: Write the proportion equation
   115,858.72 : 159,871.82 = 64,864.36 : x
2. Step 2: Convert to fraction form
   115,858.72/159,871.82 = 64,864.36/x
3. Step 3: Cross multiply
   115,858.72x = 159,871.82 × 64,864.36
4. Step 4: Simplify right side
   115,858.72x = 10,369,982,562.33
5. Step 5: Solve for x
   x = 10,369,982,562.33/115,858.72
6. Step 6: Final answer
   x = 89,505.41