Finding the Fourth Proportional to 105,724, 145,885.71 and 57,964.78

Step by Step Solution

1. Step 1: Write the proportion equation
   105,724 : 145,885.71 = 57,964.78 : x
2. Step 2: Convert to fraction form
   105,724/145,885.71 = 57,964.78/x
3. Step 3: Cross multiply
   105,724x = 145,885.71 × 57,964.78
4. Step 4: Simplify right side
   105,724x = 8,456,233,085.29
5. Step 5: Solve for x
   x = 8,456,233,085.29/105,724
6. Step 6: Final answer
   x = 79,984.04