Finding the Fourth Proportional to 72,957.07, 100,680.72 and 39,423.07

Step by Step Solution

1. Step 1: Write the proportion equation
   72,957.07 : 100,680.72 = 39,423.07 : x
2. Step 2: Convert to fraction form
   72,957.07/100,680.72 = 39,423.07/x
3. Step 3: Cross multiply
   72,957.07x = 100,680.72 × 39,423.07
4. Step 4: Simplify right side
   72,957.07x = 3,969,142,568.81
5. Step 5: Solve for x
   x = 3,969,142,568.81/72,957.07
6. Step 6: Final answer
   x = 54,403.81