Finding the Fourth Proportional to 105,045.68, 144,965 and 57,300.72

Step by Step Solution

1. Step 1: Write the proportion equation
   105,045.68 : 144,965 = 57,300.72 : x
2. Step 2: Convert to fraction form
   105,045.68/144,965 = 57,300.72/x
3. Step 3: Cross multiply
   105,045.68x = 144,965 × 57,300.72
4. Step 4: Simplify right side
   105,045.68x = 8,306,598,874.80
5. Step 5: Solve for x
   x = 8,306,598,874.80/105,045.68
6. Step 6: Final answer
   x = 79,076.06