Finding the Fourth Proportional to 105,418.90, 145,471.89 and 57,662.74

Step by Step Solution

1. Step 1: Write the proportion equation
   105,418.90 : 145,471.89 = 57,662.74 : x
2. Step 2: Convert to fraction form
   105,418.90/145,471.89 = 57,662.74/x
3. Step 3: Cross multiply
   105,418.90x = 145,471.89 × 57,662.74
4. Step 4: Simplify right side
   105,418.90x = 8,388,307,770.38
5. Step 5: Solve for x
   x = 8,388,307,770.38/105,418.90
6. Step 6: Final answer
   x = 79,571.19