Finding the Fourth Proportional to 105,217, 145,198.59 and 57,470.38

Step by Step Solution

1. Step 1: Write the proportion equation
   105,217 : 145,198.59 = 57,470.38 : x
2. Step 2: Convert to fraction form
   105,217/145,198.59 = 57,470.38/x
3. Step 3: Cross multiply
   105,217x = 145,198.59 × 57,470.38
4. Step 4: Simplify right side
   105,217x = 8,344,618,142.76
5. Step 5: Solve for x
   x = 8,344,618,142.76/105,217
6. Step 6: Final answer
   x = 79,308.65