Finding the Fourth Proportional to 115,871.28, 159,894.72 and 64,875.12

Step by Step Solution

1. Step 1: Write the proportion equation
   115,871.28 : 159,894.72 = 64,875.12 : x
2. Step 2: Convert to fraction form
   115,871.28/159,894.72 = 64,875.12/x
3. Step 3: Cross multiply
   115,871.28x = 159,894.72 × 64,875.12
4. Step 4: Simplify right side
   115,871.28x = 10,373,189,147.37
5. Step 5: Solve for x
   x = 10,373,189,147.37/115,871.28
6. Step 6: Final answer
   x = 89,523.38