Finding the Fourth Proportional to 115,698.72, 159,661.04 and 64,711.55

Step by Step Solution

1. Step 1: Write the proportion equation
   115,698.72 : 159,661.04 = 64,711.55 : x
2. Step 2: Convert to fraction form
   115,698.72/159,661.04 = 64,711.55/x
3. Step 3: Cross multiply
   115,698.72x = 159,661.04 × 64,711.55
4. Step 4: Simplify right side
   115,698.72x = 10,331,913,373.01
5. Step 5: Solve for x
   x = 10,331,913,373.01/115,698.72
6. Step 6: Final answer
   x = 89,300.15