Finding the Fourth Proportional to 115,289.50, 159,101.94 and 64,988.50

Step by Step Solution

1. Step 1: Write the proportion equation
   115,289.50 : 159,101.94 = 64,988.50 : x
2. Step 2: Convert to fraction form
   115,289.50/159,101.94 = 64,988.50/x
3. Step 3: Cross multiply
   115,289.50x = 159,101.94 × 64,988.50
4. Step 4: Simplify right side
   115,289.50x = 10,339,796,427.69
5. Step 5: Solve for x
   x = 10,339,796,427.69/115,289.50
6. Step 6: Final answer
   x = 89,685.50