Finding the Fourth Proportional to 105,084.42, 145,016.98 and 57,338.78

Step by Step Solution

1. Step 1: Write the proportion equation
   105,084.42 : 145,016.98 = 57,338.78 : x
2. Step 2: Convert to fraction form
   105,084.42/145,016.98 = 57,338.78/x
3. Step 3: Cross multiply
   105,084.42x = 145,016.98 × 57,338.78
4. Step 4: Simplify right side
   105,084.42x = 8,315,096,712.48
5. Step 5: Solve for x
   x = 8,315,096,712.48/105,084.42
6. Step 6: Final answer
   x = 79,127.78