Finding the Fourth Proportional to 261,808.47, 392,704.89 and 72,280.41

Step by Step Solution

1. Step 1: Write the proportion equation
   261,808.47 : 392,704.89 = 72,280.41 : x
2. Step 2: Convert to fraction form
   261,808.47/392,704.89 = 72,280.41/x
3. Step 3: Cross multiply
   261,808.47x = 392,704.89 × 72,280.41
4. Step 4: Simplify right side
   261,808.47x = 28,384,870,458.20
5. Step 5: Solve for x
   x = 28,384,870,458.20/261,808.47
6. Step 6: Final answer
   x = 108,418.46