Finding the Fourth Proportional to 105,938.40, 146,196.06 and 57,540.79

Step by Step Solution

1. Step 1: Write the proportion equation
   105,938.40 : 146,196.06 = 57,540.79 : x
2. Step 2: Convert to fraction form
   105,938.40/146,196.06 = 57,540.79/x
3. Step 3: Cross multiply
   105,938.40x = 146,196.06 × 57,540.79
4. Step 4: Simplify right side
   105,938.40x = 8,412,236,787.29
5. Step 5: Solve for x
   x = 8,412,236,787.29/105,938.40
6. Step 6: Final answer
   x = 79,406.87