Finding the Fourth Proportional to 72,979.50, 100,711.72 and 39,445.50

Step by Step Solution

1. Step 1: Write the proportion equation
   72,979.50 : 100,711.72 = 39,445.50 : x
2. Step 2: Convert to fraction form
   72,979.50/100,711.72 = 39,445.50/x
3. Step 3: Cross multiply
   72,979.50x = 100,711.72 × 39,445.50
4. Step 4: Simplify right side
   72,979.50x = 3,972,624,151.26
5. Step 5: Solve for x
   x = 3,972,624,151.26/72,979.50
6. Step 6: Final answer
   x = 54,434.80