Finding the Fourth Proportional to 115,280.25, 159,086.75 and 64,979.25

Step by Step Solution

1. Step 1: Write the proportion equation
   115,280.25 : 159,086.75 = 64,979.25 : x
2. Step 2: Convert to fraction form
   115,280.25/159,086.75 = 64,979.25/x
3. Step 3: Cross multiply
   115,280.25x = 159,086.75 × 64,979.25
4. Step 4: Simplify right side
   115,280.25x = 10,337,337,375.04
5. Step 5: Solve for x
   x = 10,337,337,375.04/115,280.25
6. Step 6: Final answer
   x = 89,671.37