Finding the Fourth Proportional to 115,711.83, 159,636.69 and 72,666

Step by Step Solution

1. Step 1: Write the proportion equation
   115,711.83 : 159,636.69 = 72,666 : x
2. Step 2: Convert to fraction form
   115,711.83/159,636.69 = 72,666/x
3. Step 3: Cross multiply
   115,711.83x = 159,636.69 × 72,666
4. Step 4: Simplify right side
   115,711.83x = 11,600,159,715.54
5. Step 5: Solve for x
   x = 11,600,159,715.54/115,711.83
6. Step 6: Final answer
   x = 100,250.42