Finding the Fourth Proportional to 105,229.20, 145,219.42 and 57,483.34

Step by Step Solution

1. Step 1: Write the proportion equation
   105,229.20 : 145,219.42 = 57,483.34 : x
2. Step 2: Convert to fraction form
   105,229.20/145,219.42 = 57,483.34/x
3. Step 3: Cross multiply
   105,229.20x = 145,219.42 × 57,483.34
4. Step 4: Simplify right side
   105,229.20x = 8,347,697,294.46
5. Step 5: Solve for x
   x = 8,347,697,294.46/105,229.20
6. Step 6: Final answer
   x = 79,328.72