Finding the Fourth Proportional to 72,946.31, 100,665.92 and 39,412.31

Step by Step Solution

1. Step 1: Write the proportion equation
   72,946.31 : 100,665.92 = 39,412.31 : x
2. Step 2: Convert to fraction form
   72,946.31/100,665.92 = 39,412.31/x
3. Step 3: Cross multiply
   72,946.31x = 100,665.92 × 39,412.31
4. Step 4: Simplify right side
   72,946.31x = 3,967,476,500.08
5. Step 5: Solve for x
   x = 3,967,476,500.08/72,946.31
6. Step 6: Final answer
   x = 54,388.99