Finding the Fourth Proportional to 72,980.78, 100,713.48 and 39,446.78

Step by Step Solution

1. Step 1: Write the proportion equation
   72,980.78 : 100,713.48 = 39,446.78 : x
2. Step 2: Convert to fraction form
   72,980.78/100,713.48 = 39,446.78/x
3. Step 3: Cross multiply
   72,980.78x = 100,713.48 × 39,446.78
4. Step 4: Simplify right side
   72,980.78x = 3,972,822,488.59
5. Step 5: Solve for x
   x = 3,972,822,488.59/72,980.78
6. Step 6: Final answer
   x = 54,436.56